From c3969970ce9d92fd278bf48c169efb0fe07218f9 Mon Sep 17 00:00:00 2001 From: t4sk Date: Thu, 28 Sep 2023 20:34:27 +0900 Subject: [PATCH] Updates --- 404.html | 6 +- assets/index-37e33218.js | 1171 -------------------- assets/index-bf55bfed.css | 10 + assets/index-c1942f77.js | 1175 +++++++++++++++++++++ assets/index-cf8e1897.css | 10 - constants/index.html | 6 +- constructor/index.html | 6 +- create-new-contract/index.html | 6 +- default-function/index.html | 6 +- defi/curve-liquidity/index.html | 6 +- defi/curve-swap/index.html | 6 +- delegate-call/index.html | 6 +- dynamic-arrays/index.html | 6 +- error/index.html | 6 +- event/index.html | 6 +- for-loop/index.html | 6 +- function/index.html | 6 +- hash-function/index.html | 6 +- hello-world/index.html | 6 +- if-else/index.html | 6 +- immutable/index.html | 6 +- index.html | 6 +- interface/index.html | 6 +- internal-external-functions/index.html | 6 +- payable/index.html | 6 +- print/index.html | 6 +- private-public-state-variables/index.html | 6 +- raw-call/index.html | 6 +- re-entrancy-lock/index.html | 6 +- references/index.html | 6 +- self-destruct/index.html | 6 +- send-ether/index.html | 6 +- unsafe-math/index.html | 6 +- values/index.html | 6 +- verify-signature/index.html | 6 +- view-pure-functions/index.html | 6 +- 36 files changed, 1281 insertions(+), 1277 deletions(-) delete mode 100644 assets/index-37e33218.js create mode 100644 assets/index-bf55bfed.css create mode 100644 assets/index-c1942f77.js delete mode 100644 assets/index-cf8e1897.css diff --git a/404.html b/404.html index ac8581f..43fde17 100644 --- a/404.html +++ b/404.html @@ -1,4 +1,4 @@ - + @@ -31,8 +31,8 @@ gtag("config", "G-KTVFSR7C2H") - - + + diff --git a/assets/index-37e33218.js b/assets/index-37e33218.js deleted file mode 100644 index 1431c46..0000000 --- a/assets/index-37e33218.js +++ /dev/null @@ -1,1171 +0,0 @@ -function Qp(e,n){for(var t=0;ts[r]})}}}return 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Constants are variables that cannot change.

-
# @version ^0.3.9
-
-MY_CONSTANT: constant(uint256) = 123
-MIN: constant(uint256) = 1
-MAX: constant(uint256) = 10
-ADDR: constant(address) = 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B
-
-
-@external
-@pure
-def getBuiltInConstants() -> (address, uint256, bytes32):
-    # Commonly used constants availabe in Vyper
-    return (ZERO_ADDRESS, MAX_UINT256, EMPTY_BYTES32)
-
-
-@external
-@pure
-def getMyConstants() -> (uint256, uint256, address):
-    return (MIN, MAX, ADDR)
-
`,$y=({prev:e,next:n})=>y.jsx(b,{version:zy,title:Fy,description:My,html:Uy,prev:e,next:n}),Hy="0.3.9",By="Constructor",Vy="Constructor in Vyper",Wy=`

__init__ is a special function that is executed only once when the contract is deployed.

-
# @version ^0.3.9
-
-owner: public(address)
-name: public(String[10])
-createdAt: public(uint256)
-expiresAt: public(uint256)
-
-
-@external
-def __init__(name: String[10], duration: uint256):
-    # set owner to caller
-    self.owner = msg.sender
-    # set name from input
-    self.name = name
-    self.createdAt = block.timestamp
-    self.expiresAt = block.timestamp + duration
-
`,Qy=({prev:e,next:n})=>y.jsx(b,{version:Hy,title:By,description:Vy,html:Wy,prev:e,next:n}),Yy="0.3.9",Ky="Create New Contract",Xy="Create new contract in Vyper",Gy=`

Vyper contracts can deploy new contracts using the function create_forwarder_to.

-

create_forwarder_to is also known as "minimal proxy contract". How it works, we won't explain it here.

-

Here we will focus on how to use it to deploy new contracts.

-

How to use create_forwarder_to

-
    -
  1. Deploy ContractToDeploy. This is the "master copy." All deployed contracts will execute code from this master copy.
    2. -
  2. Call deploy() passing the address of the master copy and any other arguments needed to setup the new contract
    3. -
-

Here is ContractToDeploy

-

ContractToDeploy.vy

-
# @version ^0.3.9
-
-
-owner: public(address)
-
-
-# __init__ is not called when deployed from create_forwarder_to
-@external
-def __init__():
-  self.owner = msg.sender
-
-
-# call once after create_forwarder_to
-@external
-def setup(owner: address):
-  assert self.owner == ZERO_ADDRESS, "owner != zero address"
-  self.owner = owner
-
-
-# DANGER: never have selfdestruct in original contract used by create_forwarder_to
-@external
-def kill():
-  selfdestruct(msg.sender)
-

Create.vy

-
# @version ^0.3.9
-
-
-interface ContractToDeploy:
-    def setup(owner: address): nonpayable
-
-
-event Log:
-    addr: address
-
-
-@external
-def deploy(_masterCopy: address, owner: address):
-    addr: address = create_forwarder_to(_masterCopy)
-    ContractToDeploy(addr).setup(owner)
-    log Log(addr)
-
-
-@external
-def deployTest(_masterCopy: address):
-    addr: address = create_forwarder_to(_masterCopy)
-    ContractToDeploy(addr).setup(self)
-    log Log(addr)
-
`,qy=({prev:e,next:n})=>y.jsx(b,{version:Yy,title:Ky,description:Xy,html:Gy,prev:e,next:n}),Zy="0.3.9",Jy="Default Function",ev="Default function in Vyper",nv=`

A contract can have a default function, executed when a function that does not exist is called. This is the same function as the fallback function in Solidity.

-

This function is named __default__ and it is commonly used to receive Ether.

-
# @version ^0.3.9
-
-
-event Payment:
-    sender: indexed(address)
-    amount: uint256
-
-
-@external
-@payable
-def __default__():
-    log Payment(msg.sender, msg.value)
-
`,tv=({prev:e,next:n})=>y.jsx(b,{version:Zy,title:Jy,description:ev,html:nv,prev:e,next:n}),sv="0.3.9",rv="Curve Add and Remove Liquidity",lv="Curve Add and Remove Liquidity",av=`

Add and remove liquidity from Curve pools

-
# @version ^0.3.9
-
-from vyper.interfaces import ERC20
-
-
-interface IStableSwap:
-    def add_liquidity(amounts: uint256[3], min_shares: uint256): nonpayable
-    def remove_liquidity(shares: uint256, min_amounts: uint256[3]): nonpayable
-    def remove_liquidity_one_coin(shares: uint256, i: int128, min_amount: uint256): nonpayable
-    def get_virtual_price() -> uint256: view
-
-
-DAI: constant(address) = 0x6B175474E89094C44Da98b954EedeAC495271d0F
-USDC: constant(address) = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
-USDT: constant(address) = 0xdAC17F958D2ee523a2206206994597C13D831ec7
-
-POOL: constant(address) = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
-COINS: constant(address[3]) = [DAI, USDC, USDT]
-
-
-@internal
-def _safeTransfer(coin: address, to: address, amount: uint256):
-    res: Bytes[32] = raw_call(
-        coin,
-        concat(
-            method_id("transfer(address,uint256)"),
-            convert(to, bytes32),
-            convert(amount, bytes32),
-        ),
-        max_outsize=32,
-    )
-
-    if len(res) > 0:
-        assert convert(res, bool)
-
-
-@internal
-def _safeTransferFrom(coin: address, _from: address, to: address, amount: uint256):
-    res: Bytes[32] = raw_call(
-        coin,
-        concat(
-            method_id("transferFrom(address,address,uint256)"),
-            convert(_from, bytes32),
-            convert(to, bytes32),
-            convert(amount, bytes32),
-        ),
-        max_outsize=32,
-    )
-
-    if len(res) > 0:
-        assert convert(res, bool)
-
-
-@internal
-def _safeApprove(coin: address, to: address, amount: uint256):
-    res: Bytes[32] = raw_call(
-        coin,
-        concat(
-            method_id("approve(address,uint256)"),
-            convert(to, bytes32),
-            convert(amount, bytes32),
-        ),
-        max_outsize=32,
-    )
-
-    if len(res) > 0:
-        assert convert(res, bool)
-
-
-@external
-def addLiquidity(amounts: uint256[3], min_shares: uint256):
-    for i in range(3):
-        if amounts[i] > 0:
-            self._safeTransferFrom(COINS[i], msg.sender, self, amounts[i])
-            self._safeApprove(COINS[i], POOL, amounts[i])
-
-    IStableSwap(POOL).add_liquidity(amounts, min_shares)
-
-
-@external
-@view
-def calculateValueOfShares(shares: uint256) -> uint256:
-    return shares * IStableSwap(POOL).get_virtual_price() / 10**18
-
-
-@external
-def removeLiquidity(shares: uint256, min_amounts: uint256[3]):
-    IStableSwap(POOL).remove_liquidity(shares, min_amounts)
-
-    for coin in COINS:
-        bal: uint256 = ERC20(coin).balanceOf(self)
-        self._safeTransfer(coin, msg.sender, bal)
-
-
-@external
-def removeLiquidityOneCoin(shares: uint256, i: int128, min_amount: uint256):
-    IStableSwap(POOL).remove_liquidity_one_coin(shares, i, min_amount)
-
-    bal: uint256 = ERC20(COINS[i]).balanceOf(self)
-    self._safeTransfer(COINS[i], msg.sender, bal)
-
`,ov=({prev:e,next:n})=>y.jsx(b,{version:sv,title:rv,description:lv,html:av,prev:e,next:n}),iv="0.3.9",uv="Curve Swap",cv="Curve Swap",pv=`

Swap tokens on Curve

-
# @version ^0.3.9
-
-from vyper.interfaces import ERC20
-
-
-interface IStableSwap:
-    def exchange(i: int128, j: int128, dx: uint256, min_dy: uint256): nonpayable
-
-
-DAI: constant(address) = 0x6B175474E89094C44Da98b954EedeAC495271d0F
-USDC: constant(address) = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
-USDT: constant(address) = 0xdAC17F958D2ee523a2206206994597C13D831ec7
-
-POOL: constant(address) = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
-COINS: constant(address[3]) = [DAI, USDC, USDT]
-
-
-@internal
-def _safeTransfer(coin: address, to: address, amount: uint256):
-    res: Bytes[32] = raw_call(
-        coin,
-        concat(
-            method_id("transfer(address,uint256)"),
-            convert(to, bytes32),
-            convert(amount, bytes32),
-        ),
-        max_outsize=32,
-    )
-
-    if len(res) > 0:
-        assert convert(res, bool)
-
-
-@internal
-def _safeTransferFrom(coin: address, _from: address, to: address, amount: uint256):
-    res: Bytes[32] = raw_call(
-        coin,
-        concat(
-            method_id("transferFrom(address,address,uint256)"),
-            convert(_from, bytes32),
-            convert(to, bytes32),
-            convert(amount, bytes32),
-        ),
-        max_outsize=32,
-    )
-
-    if len(res) > 0:
-        assert convert(res, bool)
-
-
-@internal
-def _safeApprove(coin: address, to: address, amount: uint256):
-    res: Bytes[32] = raw_call(
-        coin,
-        concat(
-            method_id("approve(address,uint256)"),
-            convert(to, bytes32),
-            convert(amount, bytes32),
-        ),
-        max_outsize=32,
-    )
-
-    if len(res) > 0:
-        assert convert(res, bool)
-
-
-@external
-def swap(i: int128, j: int128, dx: uint256, min_dy: uint256):
-    self._safeTransferFrom(COINS[i], msg.sender, self, dx)
-    self._safeApprove(COINS[i], POOL, dx)
-
-    IStableSwap(POOL).exchange(i, j, dx, min_dy)
-
-    bal: uint256 = ERC20(COINS[j]).balanceOf(self)
-    self._safeTransfer(COINS[j], msg.sender, bal)
-
`,dv=({prev:e,next:n})=>y.jsx(b,{version:iv,title:uv,description:cv,html:pv,prev:e,next:n}),fv="0.3.9",hv="Delegate Call",mv="Delegate call in Vyper",yv=`

When contract A delegates call to contract B, B's code will be executed inside contract A. This will update state variables and Ether balance inside contract A and not B.

-

Delegate call is commonly used to create an upgradable contract.

-

Here is the contract that we will delegate call to.

-

TestDelegateCall.vy

-
# @version ^0.3.9
-
-# State variables must be declared in the same order
-# as contract making the call
-x: public(uint256)
-y: public(uint256)
-
-
-@external
-def updateX(x: uint256):
-    # when this function is called with delegate call
-    # this will update self.x inside the calling contract
-    self.x = x + 1
-
-
-@external
-def updateY(y: uint256):
-    self.y = y * y
-

DelegateCall.vy

-
# @version ^0.3.9
-
-
-x: public(uint256)
-y: public(uint256)
-
-
-@external
-def updateX(to: address, x: uint256):
-    raw_call(
-        to,
-        concat(
-            method_id("updateX(uint256)"),
-            convert(x, bytes32)
-        ),
-        is_delegate_call=True
-    )
-
-
-@external
-def updateY(to: address, y: uint256):
-    raw_call(
-        to,
-        concat(
-            method_id("updateY(uint256)"),
-            convert(y, bytes32)
-        ),
-        is_delegate_call=True
-    )
-
`,vv=({prev:e,next:n})=>y.jsx(b,{version:fv,title:hv,description:mv,html:yv,prev:e,next:n}),gv="0.3.9",jv="Dynamic Arrays",wv="Dynamic arrays in Vyper",xv=`

Dynamic arrays are bounded arrays whose length can change. The length of the array cannot exceed the maximum length set where the array is declared.

-
# @version ^0.3.9
-
-# Dynamic array of type uint256, max 3 elements
-nums: DynArray[uint256, 3]
-
-@external
-def __init__():
-    self.nums.append(11)
-    self.nums.append(22)
-    self.nums.append(33)
-    # This will revert (Appending to array with max 3 elements)
-    # self.nums.append(44)
-
-    # Remove last element
-    self.nums.pop()
-
-    # Delete all elements
-    self.nums = []
-    # Set values
-    self.nums = [1,2,3]
-
-
-@external
-@pure
-def examples(xs: DynArray[uint256, 5]) -> DynArray[uint256, 8]:
-    ys: DynArray[uint256, 5] = [1,2,3]
-    # Copy xs into ys
-    for x in xs:
-        ys.append(x)
-    return ys
-
-
-@external
-@pure
-def filter(addrs: DynArray[address, 5]) -> DynArray[address, 5]:
-    nonzeros: DynArray[address, 5] = []
-    for addr in addrs:
-        if addr != ZERO_ADDRESS:
-            nonzeros.append(addr)
-    return nonzeros
-
`,kv=({prev:e,next:n})=>y.jsx(b,{version:gv,title:jv,description:wv,html:xv,prev:e,next:n}),_v="0.3.9",Sv="Error",Ev="Error in Vyper",Cv=`

Use assert and raise to check inputs and validate state.

-

When an error occurs, it will halt the entire function call, undoing any changes.

-

You will still need to pay gas for the failed transaction.

-
# @version ^0.3.9
-
-x: public(uint256)
-owner: public(address)
-
-
-@external
-def __init__():
-    self.owner = msg.sender
-
-
-@external
-def testAssert(x: uint256):
-    assert x >= 1, "x < 1"
-    # self.x will not be updated if there is an error from line above
-    self.x = x
-
-
-@external
-def testRaise(x: uint256):
-    # same check as above using "raise"
-    if x <= 1:
-        raise "x < 1"
-    self.x = x
-
-
-@internal
-def _testErrorBubblesUp(x: uint256):
-    assert x >= 1, "x < 1"
-    self.x = x
-
-
-@external
-def testErrorBubblesUp(x: uint256):
-    self._testErrorBubblesUp(x)
-    # self.x = 123 will not be executed if there is an error
-    # from function above
-    self.x = 123
-
-
-@external
-def setOwner(owner: address):
-    assert msg.sender == self.owner, "!owner"
-    assert owner != ZERO_ADDRESS, "owner = zero"
-    self.owner = owner
-
`,Tv=({prev:e,next:n})=>y.jsx(b,{version:_v,title:Sv,description:Ev,html:Cv,prev:e,next:n}),Pv="0.3.9",Nv="Event",Ov="Event in Vyper",Av=`

Events write logs to the blockchain, commonly used by application to monitor blockchain state and as a cheaper alternative to store data on the blockchain without using state variables.

-

Events can be efficiently searched by indexing their arguments. Up to 3 parameters can be indexed.

-
# @version ^0.3.9
-
-# up to 3 index
-event Transfer:
-    # enables quick search of all Transfer events where sender is a certain address
-    sender: indexed(address)
-    # enables quick search of all Transfer events where receiver is a certain address
-    receiver: indexed(address)
-    amount: uint256
-
-
-@external
-def transfer(receiver: address, amount: uint256):
-    # some code ...
-    log Transfer(msg.sender, receiver, amount)
-
-
-@external
-def mint(amount: uint256):
-    # some code ...
-    log Transfer(ZERO_ADDRESS, msg.sender, amount)
-
-
-@external
-def burn(amount: uint256):
-    # some code ...
-    log Transfer(msg.sender, ZERO_ADDRESS, amount)
-
`,Rv=({prev:e,next:n})=>y.jsx(b,{version:Pv,title:Nv,description:Ov,html:Av,prev:e,next:n}),Lv="0.3.9",Iv="For Loop",Dv="For loop in Vyper",bv=`

There are 2 ways to loop through an array, using range and directly looping through array elements.

-
# @version ^0.3.9
-
-
-@external
-@pure
-def forLoop():
-    # for loop through range
-    # sum from 0 to 9
-    s: uint256 = 0
-    for i in range(10):
-        s += i
-
-    # for loop through array elements
-    # find minimum of nums
-    nums: uint256[5] = [4, 5, 1, 9, 0]
-    x: uint256 = MAX_UINT256
-    for num in nums:
-        if x < num:
-            x = num
-
-    # continue - skip current iteration
-    # break - exit for loop
-    c: uint256 = 0
-    for i in [1, 2, 3, 4, 5]:
-        # skip 2
-        if i == 2:
-            continue
-        # end loop at i = 4
-        if i == 4:
-            break
-        # otherwise increment c by 1
-        c += 1
-    # c = 2 (incremented at i = 1 and 3)
-
-
-@external
-@pure
-def sum(nums: uint256[10]) -> uint256:
-    s: uint256 = 0
-    for n in nums:
-        s += n
-    return s
-
`,zv=({prev:e,next:n})=>y.jsx(b,{version:Lv,title:Iv,description:Dv,html:bv,prev:e,next:n}),Fv="0.3.9",Mv="Function",Uv="Function in Vyper",$v=`
# @version ^0.3.9
-
-
-@external
-@pure
-def multiply(x: uint256, y: uint256) -> uint256:
-    return x * y
-
-
-@external
-@pure
-def divide(x: uint256, y: uint256) -> uint256:
-    return x / y
-
-
-# A funciton that does nothing
-@external
-def doNothing():
-    # pass is useful when you want to compile the contract now,
-    # write the code later
-    pass
-
-
-# Functions can return multiple outputs
-@external
-@pure
-def multiOut() -> (uint256, bool):
-    return (1, True)
-
-
-@external
-@pure
-def addAndSub(x: uint256, y: uint256) -> (uint256, uint256):
-    return (x + y, x - y)
-
`,Hv=({prev:e,next:n})=>y.jsx(b,{version:Fv,title:Mv,description:Uv,html:$v,prev:e,next:n}),Bv="0.3.9",Vv="Hash Function",Wv="Hash function in Vyper",Qv=`

Vyper supports the same hash function available in Solidity, keccack256.

-
# @version ^0.3.9
-
-
-@external
-@pure
-def getHash(addr: address, num: uint256, ) -> bytes32:
-    # input of keccak256 can be String, Bytes or bytes32
-    return keccak256(
-        # convert different data into Bytes
-        concat(
-            convert(addr, bytes32),
-            convert(num, bytes32),
-            convert("THIS IS A STRING", Bytes[16])
-        )
-    )
-
-
-@external
-@pure
-def getMessageHash(_str: String[100]) -> bytes32:
-    return keccak256(_str)
-
`,Yv=({prev:e,next:n})=>y.jsx(b,{version:Bv,title:Vv,description:Wv,html:Qv,prev:e,next:n}),Kv="0.3.9",Xv="Hello World",Gv="Hello world in Vyper",qv=`

@version specifies the compiler version of Vyper.

-
# @version ^0.3.0
-
-# Create a string variable that can store maximum 100 characters
-greet: public(String[100])
-
-@external
-def __init__():
-    self.greet = "Hello World"
-
`,Zv=({prev:e,next:n})=>y.jsx(b,{version:Kv,title:Xv,description:Gv,html:qv,prev:e,next:n}),Jv="0.3.9",eg="If Else Conditional Statement",ng="If else conditional statement in Vyper",tg=`
# @version ^0.3.9
-
-
-@external
-def ifElse(x: uint256) -> uint256:
-    if x <= 10:
-        return 1
-    elif x <= 20:
-        return 2
-    else:
-        return 3
-
-
-@external
-@pure
-def absoluteValue(x: uint256, y: uint256) -> uint256:
-    if x >= y:
-        return x - y
-    return y - x
-
`,sg=({prev:e,next:n})=>y.jsx(b,{version:Jv,title:eg,description:ng,html:tg,prev:e,next:n}),rg="0.3.9",lg="Immutable",ag="Immutable in Vyper",og=`

Immutable variables are like constants except value are assigned when the contract is deployed.

-

When to use immutable variables?

-
    -
  • You have a variable that needs to be set when the contract is deployed, -for example like setting contract owner to msg.sender
    • -
  • and this variable will never change after deployment
    • -
-

Why declare variables as immutable?

-

Like constants, immutable variables save run time gas

-
# @version ^0.3.9
-
-OWNER: immutable(address)
-MY_IMMUTABLE: immutable(uint256)
-
-@external
-def __init__(_val: uint256):
-    OWNER = msg.sender
-    MY_IMMUTABLE = _val
-
-
-@external
-@pure
-def getMyImmutable() -> uint256:
-  return MY_IMMUTABLE
-
`,ig=({prev:e,next:n})=>y.jsx(b,{version:rg,title:lg,description:ag,html:og,prev:e,next:n}),ug="0.3.9",cg="Interface",pg="Interface in Vyper",dg=`

Use interface to call other smart contracts.

-

Here is the TestInterface self.contract that we will call.

-

TestInterface.vy

-
# @version ^0.3.9
-
-
-owner: public(address)
-eth: public(uint256)
-
-
-@external
-def setOwner(owner: address):
-    self.owner = owner
-
-
-@external
-@payable
-def sendEth():
-    self.eth = msg.value
-
-
-@external
-@payable
-def setOwnerAndSendEth(owner: address):
-    self.owner = owner
-    self.eth = msg.value
-

Interface.vy

-
# @version ^0.3.9
-
-
-interface TestInterface:
-    # get address of owner
-    def owner() -> address: view
-    # set new owner
-    def setOwner(owner: address): nonpayable
-    # send ETH
-    def sendEth(): payable
-    # set owner and send ETH
-    def setOwnerAndSendEth(owner: address): payable
-
-
-# store contract having the above interface
-test: public(TestInterface)
-
-
-@external
-def __init__(test: address):
-    # store contract instance
-    self.test = TestInterface(test)
-    # if you need to get address from self.test
-    addr: address = self.test.address
-
-
-@external
-@view
-def getOwner() -> address:
-    return self.test.owner()
-
-
-@external
-@view
-def getOwnerFromAddress(test: address) -> address:
-    # you can also call functions by passing in the address of the interface
-    return TestInterface(test).owner()
-
-
-@external
-def setOwner(owner: address):
-    self.test.setOwner(owner)
-
-
-@external
-@payable
-def sendEth():
-    self.test.sendEth(value=msg.value)
-
-
-@external
-@payable
-def setOwnerAndSendEth(owner: address):
-    self.test.setOwnerAndSendEth(owner, value=msg.value)
-
`,fg=({prev:e,next:n})=>y.jsx(b,{version:ug,title:cg,description:pg,html:dg,prev:e,next:n}),hg="0.3.9",mg="Internal and External Functions",yg="Internal and external functions in Vyper",vg=`

@internal functions can only be called inside the contract.

-

@external functions can only be called from outside the contract.

-
# @version ^0.3.9
-
-# Internal functions can only be called inside this contract
-@internal
-@pure
-def _add(x: uint256, y: uint256) -> uint256:
-    return x + y
-
-
-@external
-@view
-def extFunc() -> bool:
-    return True
-
-
-# External functions can only be called from outside this contract
-@external
-@view
-def avg(x: uint256, y: uint256) -> uint256:
-    # cannot call other external function
-    # self.extFunc()
-
-    # can call internal functions
-    z: uint256 = self._add(x, y)
-
-    return (x + y) / 2
-
-
-@internal
-@pure
-def _sqr(x: uint256) -> uint256:
-    return x * x
-
-
-@external
-@view
-def sumOfSquares(x: uint256, y: uint256) -> uint256:
-    return self._sqr(x) + self._sqr(y)
-
`,gg=({prev:e,next:n})=>y.jsx(b,{version:hg,title:mg,description:yg,html:vg,prev:e,next:n}),jg="0.3.9",wg="Payable",xg="Payable in Vyper",kg=`

Functions declared with @payable can receive Ether.

-
# @version ^0.3.9
-
-
-event Deposit:
-    sender: indexed(address)
-    amount: uint256
-
-
-@external
-@payable
-def deposit():
-    log Deposit(msg.sender, msg.value)
-
-
-@external
-@view
-def getBalance() -> uint256:
-    # Get balance of Ether stored in this contract
-    return self.balance
-
-
-owner: public(address)
-
-
-@external
-@payable
-def pay():
-    assert msg.value > 0, "msg.value = 0"
-    self.owner = msg.sender
-
`,_g=({prev:e,next:n})=>y.jsx(b,{version:jg,title:wg,description:xg,html:kg,prev:e,next:n}),Sg="0.3.9",Eg="Debug with Print",Cg="Debug with Print",Tg=`

Use the built-in function print to debug smart contracts.

-

-
`,Pg=({prev:e,next:n})=>y.jsx(b,{version:Sg,title:Eg,description:Cg,html:Tg,prev:e,next:n}),Ng="0.3.9",Og="Private and Public State Variables",Ag="Private and public state variables in Vyper",Rg=`

Private state variables cannot be accessed from outside the contract.

-

Public state variables can be read by anyone, including users and other contracts.

-
# @version ^0.3.9
-
-# publis state variable
-owner: public(address)
-# private state variable
-foo: uint256
-bar: public(bool)
-
-
-@external
-def __init__():
-    self.owner = msg.sender
-    self.foo = 123
-    self.bar = True
-
`,Lg=({prev:e,next:n})=>y.jsx(b,{version:Ng,title:Og,description:Ag,html:Rg,prev:e,next:n}),Ig="0.3.9",Dg="Raw Call",bg="Raw call in Vyper",zg=`

raw_call is a low level function. It is used to call and send Ether to other functions.

-

For this example, we will write a contract that calls this contract below.

-

TestRawCall.vy

-
# @version ^0.3.9
-
-
-sender: public(address)
-
-
-@external
-def testAdd(x: uint256, y: uint256) -> uint256:
-    self.sender = msg.sender
-    return x + y
-
-
-@external
-def testSub(x: uint256, y: uint256) -> uint256:
-    self.sender = msg.sender
-    return x - y
-

RawCall.vy

-
# @version ^0.3.9
-
-
-@external
-def testRawCall(to: address, x: uint256, y: uint256):
-    res: Bytes[32] = raw_call(
-        to, # address to call
-        # data to send in Bytes
-        concat(
-            method_id("testAdd(uint256,uint256)"), # function to call
-            convert(x, bytes32), # first input
-            convert(y, bytes32), # secode input
-        ),
-        max_outsize=32, # max size of ouput, default 0
-        gas=100000, # optional, amount of gas to send, default forwards all gas
-        value=0, # optional, amount of ETH to send, default 0
-    )
-
-    z: uint256 = convert(res, uint256)
-
-
-@external
-@payable
-def sendEth(to: address):
-    # Example to send ETH
-    # data = b"", empty data
-    # value = msg.value, all of ETH that was sent to this function
-    raw_call(to, b"", value=msg.value)
-
-
-diff: public(uint256)
-
-
-@external
-def testRawCallSub(to: address, x: uint256, y: uint256):
-    res: Bytes[32] = raw_call(
-        to,
-        concat(
-            method_id("testSub(uint256,uint256)"),
-            convert(x, bytes32),
-            convert(y, bytes32)
-        ),
-        max_outsize=32,
-    )
-
-    self.diff = convert(res, uint256)
-
`,Fg=({prev:e,next:n})=>y.jsx(b,{version:Ig,title:Dg,description:bg,html:zg,prev:e,next:n}),Mg="0.3.9",Ug="Re-Entrancy Lock",$g="Re-entrancy lock in Vyper",Hg=`

Vyper has a handy way to secure your contract from re-entrancy.

-

A re-entrancy lock can be created on a function with @nonreentrant("lock").

-

Functions can be locked together by using the same name for the locks.

-
# @version ^0.3.9
-
-
-@external
-@nonreentrant("lock")
-def func0():
-    # call back msg.sender
-    raw_call(msg.sender, b"", value=0)
-
-
-@external
-@nonreentrant("lock-2")
-def func1():
-    raw_call(msg.sender, b"", value=0)
-
-
-@external
-@nonreentrant("lock-2")
-def func2():
-    raw_call(msg.sender, b"", value=0)
-
`,Bg=({prev:e,next:n})=>y.jsx(b,{version:Mg,title:Ug,description:$g,html:Hg,prev:e,next:n}),Vg="0.3.9",Wg="Data Types - References",Qg="References in Vyper",Yg=`

References types are data types that are passed by their reference, pointer to where the actual data is stored.

-
# @version ^0.3.9
-
-
-struct Person:
-    name: String[100]
-    age: uint256
-
-
-# Fixed sized list
-nums: public(uint256[10])  # must be bounded
-myMap: public(HashMap[address, uint256])
-person: public(Person)
-
-
-@external
-def __init__():
-    # This updates self.nums[0]
-    self.nums[0] = 123
-    self.nums[9] = 456
-    # Copies self.nums to array in memory.
-    # Does not modify referenced variable (self.nums)
-    arr: uint256[10] = self.nums
-    arr[0] = 123
-
-    # This updates self.myMap
-    self.myMap[msg.sender] = 1
-    self.myMap[msg.sender] = 11
-
-    # This updates self.person
-    self.person.age = 11
-    self.person.name = "Vyper"
-    # Person struct is copied into memory.
-    # Does not modify referenced variable (self.person)
-    p: Person = self.person
-    p.name = "Solidity"
-
`,Kg=({prev:e,next:n})=>y.jsx(b,{version:Vg,title:Wg,description:Qg,html:Yg,prev:e,next:n}),Xg="0.3.9",Gg="Self Destruct",qg="Self destruct in Vyper",Zg=`

selfdestruct deletes the contract from the blockchain. It takes a single input, an address to send all of Ether stored in the contract.

-
# @version ^0.3.9
-
-
-@external
-@payable
-def __default__():
-    pass
-
-
-@external
-def kill():
-    selfdestruct(msg.sender)
-
-
-@external
-def burn():
-    selfdestruct(ZERO_ADDRESS)
-
`,Jg=({prev:e,next:n})=>y.jsx(b,{version:Xg,title:Gg,description:qg,html:Zg,prev:e,next:n}),e0="0.3.9",n0="Send Ether",t0="Send ETH in Vyper",s0=`

There are two ways to send Ether from a contract, send and raw_call. Here we introduce the simpler function to use, send.

-
# @version ^0.3.9
-
-
-# Receive Ether into this contract
-@external
-@payable
-def __default__():
-    pass
-
-
-@external
-def sendEther(to: address, amount: uint256):
-    # when Ether is sent to a contract it will call 
-    # __default__ inside the receiving contract
-    # forwards 2300 gas
-    send(to, amount)
-
-
-@external
-def sendAll(to: address):
-    send(to, self.balance)
-
`,r0=({prev:e,next:n})=>y.jsx(b,{version:e0,title:n0,description:t0,html:s0,prev:e,next:n}),l0="0.3.9",a0="Unsafe Math",o0="Unsafe math in Vyper",i0=`

Critical math checks such as overflow, underflow and division by 0 can be skipped using unsafe functions

-
# @version ^0.3.9
-
-
-@external
-def test_add(x: uint256, y: uint256) -> uint256:
-    # 21510 gas
-    # return x + y
-
-    # 21472 gas
-    return unsafe_add(x, y)
-
-
-@external
-def test_sub(x: uint256, y: uint256) -> uint256:
-    # 21533 gas
-    # return x - y
-
-    # 21495 gas
-    return unsafe_sub(x, y)
-
-
-@external
-def test_mul(x: uint256, y: uint256) -> uint256:
-    # 21578 gas
-    # return x * y
-
-    # 21520 gas
-    return unsafe_mul(x, y)
-
-
-@external
-def test_div(x: uint256, y: uint256) -> uint256:
-    # 21578 gas
-    # return x / y
-
-    # 21543 gas
-    return unsafe_div(x, y)
-
`,u0=({prev:e,next:n})=>y.jsx(b,{version:l0,title:a0,description:o0,html:i0,prev:e,next:n}),c0="0.3.9",p0="Data Types - Values",d0="Values in Vyper",f0=`

Some values available in Vyper

-
    -
  • bool
    • -
  • int128
    • -
  • uint256
    • -
  • decimals
    • -
  • address
    • -
  • bytes32
    • -
  • Bytes
    • -
  • String
    • -
-
# @version ^0.3.9
-
-b: public(bool)
-i: public(int128)  # -2 ** 127 to (2 ** 127 - 1)
-u: public(uint256)  # 0 to 2 ** 256 - 1
-dec: public(decimal)  # -2 ** 127 to (2 ** 127 - 1), 10 decimal places
-addr: public(address)
-b32: public(bytes32)
-bs: public(Bytes[100])
-s: public(String[100])
-
-
-@external
-def __init__():
-    self.b = False
-    self.i = -1
-    self.u = 123
-    self.dec = 3.14
-    self.addr = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
-    self.b32 = 0xada1b75f8ae9a65dcc16f95678ac203030505c6b465c8206e26ae84b525cdacb
-    self.bs = b"\\x01"
-    self.s = "Hello Vyper"
-
`,h0=({prev:e,next:n})=>y.jsx(b,{version:c0,title:p0,description:d0,html:f0,prev:e,next:n}),m0="0.3.9",y0="Verify Signature",v0="Verify signature in Vyper",g0=`

Signing and verifying signature takes 3 steps.

-
    -
  1. Hash the data to sign. This can be done with and without a smart contract.
    2. -
  2. Sign the hash. This must be done off chain.
    3. -
  3. Verify the signature. This is done using a smart contract.
    4. -
-
# @version ^0.3.9
-
-
-# hash = getHash("Hello Vyper!")
-# 0x5436c86f18e3d25a10e557ae125450118dd0a481ca22112b1977d55a676e4c91
-@external
-@pure
-def getHash(_str: String[100]) -> bytes32:
-    return keccak256(_str)
-
-
-# getEthSignedHash(hash)
-# 0x045b623a8e8fb7b4fcfbd1ae07e7326d55303d7de4085c69b346bd130c1936da
-@external
-@pure
-def getEthSignedHash(_hash: bytes32) -> bytes32:
-    return keccak256(
-        concat(
-            b'\\x19Ethereum Signed Message:\\n32',
-            _hash
-        )
-    )
-
-
-# account = your account
-# hash = getHash("Hello Vyper!")
-# signature = await ethereum.request({ method: "personal_sign", params: [account, hash]})
-@external
-@pure
-def recoverSigner(ethSignedHash: bytes32, sig: Bytes[65]) -> address:
-    r: uint256 = convert(slice(sig, 0, 32), uint256)
-    s: uint256 = convert(slice(sig, 32, 32), uint256)
-    v: uint256 = convert(slice(sig, 64, 1), uint256)
-    return ecrecover(ethSignedHash, v, r, s)
-
-
-@external
-@pure
-def verify(sig: Bytes[65], _str: String[100], _signer: address) -> bool:
-    _hash: bytes32 = keccak256(_str)
-    ethSignedHash: bytes32 = keccak256(
-        concat(
-            b'\\x19Ethereum Signed Message:\\n32',
-            _hash
-        )
-    )
-    r: uint256 = convert(slice(sig, 0, 32), uint256)
-    s: uint256 = convert(slice(sig, 32, 32), uint256)
-    v: uint256 = convert(slice(sig, 64, 1), uint256)
-    signer: address = ecrecover(ethSignedHash, v, r, s)
-
-    return _signer == signer
-
`,j0=({prev:e,next:n})=>y.jsx(b,{version:m0,title:y0,description:v0,html:g0,prev:e,next:n}),w0="0.3.9",x0="View and Pure Functions",k0="View and pure functions in Vyper",_0=`

Both pure and view functions are read only function, they cannot write anything to the blockchain.

-

pure functions do not read any state or global variables

-

view functions can read state variables, global variables and call internal functions.

-
# @version ^0.3.9
-
-num: public(uint256)
-
-# Pure functions does not read any state or global variables
-@external
-@pure
-def pureFunc(x: uint256) -> uint256:
-    return x
-
-
-# View functions might read state or global state, or call an internal function
-@external
-@view
-def viewFunc(x: uint256) -> bool:
-    return x > self.num
-
-
-@external
-@pure
-def sum(x: uint256, y: uint256, z: uint256) -> uint256:
-    return x + y + z
-
-
-@external
-@view
-def addNum(x: uint256) -> uint256:
-    return x + self.num
-
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in Vyper",Om=`

Constants are variables that cannot change.

+
# @version ^0.3.9
+
+MY_CONSTANT: constant(uint256) = 123
+MIN: constant(uint256) = 1
+MAX: constant(uint256) = 10
+ADDR: constant(address) = 0xAb5801a7D398351b8bE11C439e05C5B3259aeC9B
+
+
+@external
+@pure
+def getBuiltInConstants() -> (address, uint256, bytes32):
+    # Commonly used constants availabe in Vyper
+    return (ZERO_ADDRESS, MAX_UINT256, EMPTY_BYTES32)
+
+
+@external
+@pure
+def getMyConstants() -> (uint256, uint256, address):
+    return (MIN, MAX, ADDR)
+
`,Im=({prev:e,next:n})=>m.jsx(z,{version:Tm,title:Lm,description:Rm,html:Om,prev:e,next:n}),Dm="0.3.9",zm="Constructor",Am="Constructor in Vyper",Fm=`

__init__ is a special function that is executed only once when the contract is deployed.

+
# @version ^0.3.9
+
+owner: public(address)
+name: public(String[10])
+createdAt: public(uint256)
+expiresAt: public(uint256)
+
+
+@external
+def __init__(name: String[10], duration: uint256):
+    # set owner to caller
+    self.owner = msg.sender
+    # set name from input
+    self.name = name
+    self.createdAt = block.timestamp
+    self.expiresAt = block.timestamp + duration
+
`,Mm=({prev:e,next:n})=>m.jsx(z,{version:Dm,title:zm,description:Am,html:Fm,prev:e,next:n}),$m="0.3.9",Um="Create New Contract",bm="Create new contract in Vyper",Vm=`

Vyper contracts can deploy new contracts using the function create_forwarder_to.

+

create_forwarder_to is also known as "minimal proxy contract". How it works, we won't explain it here.

+

Here we will focus on how to use it to deploy new contracts.

+

How to use create_forwarder_to

+
    +
  1. Deploy ContractToDeploy. This is the "master copy." All deployed contracts will execute code from this master copy.
    2. +
  2. Call deploy() passing the address of the master copy and any other arguments needed to setup the new contract
    3. +
+

Here is ContractToDeploy

+

ContractToDeploy.vy

+
# @version ^0.3.9
+
+
+owner: public(address)
+
+
+# __init__ is not called when deployed from create_forwarder_to
+@external
+def __init__():
+  self.owner = msg.sender
+
+
+# call once after create_forwarder_to
+@external
+def setup(owner: address):
+  assert self.owner == ZERO_ADDRESS, "owner != zero address"
+  self.owner = owner
+
+
+# DANGER: never have selfdestruct in original contract used by create_forwarder_to
+@external
+def kill():
+  selfdestruct(msg.sender)
+

Create.vy

+
# @version ^0.3.9
+
+
+interface ContractToDeploy:
+    def setup(owner: address): nonpayable
+
+
+event Log:
+    addr: address
+
+
+@external
+def deploy(_masterCopy: address, owner: address):
+    addr: address = create_forwarder_to(_masterCopy)
+    ContractToDeploy(addr).setup(owner)
+    log Log(addr)
+
+
+@external
+def deployTest(_masterCopy: address):
+    addr: address = create_forwarder_to(_masterCopy)
+    ContractToDeploy(addr).setup(self)
+    log Log(addr)
+
`,Bm=({prev:e,next:n})=>m.jsx(z,{version:$m,title:Um,description:bm,html:Vm,prev:e,next:n}),Hm="0.3.9",Wm="Default Function",Qm="Default function in Vyper",Km=`

A contract can have a default function, executed when a function that does not exist is called. This is the same function as the fallback function in Solidity.

+

This function is named __default__ and it is commonly used to receive Ether.

+
# @version ^0.3.9
+
+
+event Payment:
+    sender: indexed(address)
+    amount: uint256
+
+
+@external
+@payable
+def __default__():
+    log Payment(msg.sender, msg.value)
+
`,Ym=({prev:e,next:n})=>m.jsx(z,{version:Hm,title:Wm,description:Qm,html:Km,prev:e,next:n}),Xm="0.3.9",Gm="Curve Add and Remove Liquidity",Zm="Curve Add and Remove Liquidity",qm=`

Add and remove liquidity from Curve pools

+
# @version ^0.3.9
+
+from vyper.interfaces import ERC20
+
+
+interface IStableSwap:
+    def add_liquidity(amounts: uint256[3], min_shares: uint256): nonpayable
+    def remove_liquidity(shares: uint256, min_amounts: uint256[3]): nonpayable
+    def remove_liquidity_one_coin(shares: uint256, i: int128, min_amount: uint256): nonpayable
+    def get_virtual_price() -> uint256: view
+
+
+DAI: constant(address) = 0x6B175474E89094C44Da98b954EedeAC495271d0F
+USDC: constant(address) = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
+USDT: constant(address) = 0xdAC17F958D2ee523a2206206994597C13D831ec7
+
+POOL: constant(address) = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
+COINS: constant(address[3]) = [DAI, USDC, USDT]
+
+
+@internal
+def _safeTransfer(coin: address, to: address, amount: uint256):
+    res: Bytes[32] = raw_call(
+        coin,
+        concat(
+            method_id("transfer(address,uint256)"),
+            convert(to, bytes32),
+            convert(amount, bytes32),
+        ),
+        max_outsize=32,
+    )
+
+    if len(res) > 0:
+        assert convert(res, bool)
+
+
+@internal
+def _safeTransferFrom(coin: address, _from: address, to: address, amount: uint256):
+    res: Bytes[32] = raw_call(
+        coin,
+        concat(
+            method_id("transferFrom(address,address,uint256)"),
+            convert(_from, bytes32),
+            convert(to, bytes32),
+            convert(amount, bytes32),
+        ),
+        max_outsize=32,
+    )
+
+    if len(res) > 0:
+        assert convert(res, bool)
+
+
+@internal
+def _safeApprove(coin: address, to: address, amount: uint256):
+    res: Bytes[32] = raw_call(
+        coin,
+        concat(
+            method_id("approve(address,uint256)"),
+            convert(to, bytes32),
+            convert(amount, bytes32),
+        ),
+        max_outsize=32,
+    )
+
+    if len(res) > 0:
+        assert convert(res, bool)
+
+
+@external
+def addLiquidity(amounts: uint256[3], min_shares: uint256):
+    for i in range(3):
+        if amounts[i] > 0:
+            self._safeTransferFrom(COINS[i], msg.sender, self, amounts[i])
+            self._safeApprove(COINS[i], POOL, amounts[i])
+
+    IStableSwap(POOL).add_liquidity(amounts, min_shares)
+
+
+@external
+@view
+def calculateValueOfShares(shares: uint256) -> uint256:
+    return shares * IStableSwap(POOL).get_virtual_price() / 10**18
+
+
+@external
+def removeLiquidity(shares: uint256, min_amounts: uint256[3]):
+    IStableSwap(POOL).remove_liquidity(shares, min_amounts)
+
+    for coin in COINS:
+        bal: uint256 = ERC20(coin).balanceOf(self)
+        self._safeTransfer(coin, msg.sender, bal)
+
+
+@external
+def removeLiquidityOneCoin(shares: uint256, i: int128, min_amount: uint256):
+    IStableSwap(POOL).remove_liquidity_one_coin(shares, i, min_amount)
+
+    bal: uint256 = ERC20(COINS[i]).balanceOf(self)
+    self._safeTransfer(COINS[i], msg.sender, bal)
+
`,Jm=({prev:e,next:n})=>m.jsx(z,{version:Xm,title:Gm,description:Zm,html:qm,prev:e,next:n}),ey="0.3.9",ny="Curve Swap",ty="Curve Swap",sy=`

Swap tokens on Curve

+
# @version ^0.3.9
+
+from vyper.interfaces import ERC20
+
+
+interface IStableSwap:
+    def exchange(i: int128, j: int128, dx: uint256, min_dy: uint256): nonpayable
+
+
+DAI: constant(address) = 0x6B175474E89094C44Da98b954EedeAC495271d0F
+USDC: constant(address) = 0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48
+USDT: constant(address) = 0xdAC17F958D2ee523a2206206994597C13D831ec7
+
+POOL: constant(address) = 0xbEbc44782C7dB0a1A60Cb6fe97d0b483032FF1C7
+COINS: constant(address[3]) = [DAI, USDC, USDT]
+
+
+@internal
+def _safeTransfer(coin: address, to: address, amount: uint256):
+    res: Bytes[32] = raw_call(
+        coin,
+        concat(
+            method_id("transfer(address,uint256)"),
+            convert(to, bytes32),
+            convert(amount, bytes32),
+        ),
+        max_outsize=32,
+    )
+
+    if len(res) > 0:
+        assert convert(res, bool)
+
+
+@internal
+def _safeTransferFrom(coin: address, _from: address, to: address, amount: uint256):
+    res: Bytes[32] = raw_call(
+        coin,
+        concat(
+            method_id("transferFrom(address,address,uint256)"),
+            convert(_from, bytes32),
+            convert(to, bytes32),
+            convert(amount, bytes32),
+        ),
+        max_outsize=32,
+    )
+
+    if len(res) > 0:
+        assert convert(res, bool)
+
+
+@internal
+def _safeApprove(coin: address, to: address, amount: uint256):
+    res: Bytes[32] = raw_call(
+        coin,
+        concat(
+            method_id("approve(address,uint256)"),
+            convert(to, bytes32),
+            convert(amount, bytes32),
+        ),
+        max_outsize=32,
+    )
+
+    if len(res) > 0:
+        assert convert(res, bool)
+
+
+@external
+def swap(i: int128, j: int128, dx: uint256, min_dy: uint256):
+    self._safeTransferFrom(COINS[i], msg.sender, self, dx)
+    self._safeApprove(COINS[i], POOL, dx)
+
+    IStableSwap(POOL).exchange(i, j, dx, min_dy)
+
+    bal: uint256 = ERC20(COINS[j]).balanceOf(self)
+    self._safeTransfer(COINS[j], msg.sender, bal)
+
`,ry=({prev:e,next:n})=>m.jsx(z,{version:ey,title:ny,description:ty,html:sy,prev:e,next:n}),ly="0.3.9",ay="Delegate Call",oy="Delegate call in Vyper",iy=`

When contract A delegates call to contract B, B's code will be executed inside contract A. This will update state variables and Ether balance inside contract A and not B.

+

Delegate call is commonly used to create an upgradable contract.

+

Here is the contract that we will delegate call to.

+

TestDelegateCall.vy

+
# @version ^0.3.9
+
+# State variables must be declared in the same order
+# as contract making the call
+x: public(uint256)
+y: public(uint256)
+
+
+@external
+def updateX(x: uint256):
+    # when this function is called with delegate call
+    # this will update self.x inside the calling contract
+    self.x = x + 1
+
+
+@external
+def updateY(y: uint256):
+    self.y = y * y
+

DelegateCall.vy

+
# @version ^0.3.9
+
+
+x: public(uint256)
+y: public(uint256)
+
+
+@external
+def updateX(to: address, x: uint256):
+    raw_call(
+        to,
+        concat(
+            method_id("updateX(uint256)"),
+            convert(x, bytes32)
+        ),
+        is_delegate_call=True
+    )
+
+
+@external
+def updateY(to: address, y: uint256):
+    raw_call(
+        to,
+        concat(
+            method_id("updateY(uint256)"),
+            convert(y, bytes32)
+        ),
+        is_delegate_call=True
+    )
+
`,uy=({prev:e,next:n})=>m.jsx(z,{version:ly,title:ay,description:oy,html:iy,prev:e,next:n}),cy="0.3.9",py="Dynamic Arrays",dy="Dynamic arrays in Vyper",fy=`

Dynamic arrays are bounded arrays whose length can change. The length of the array cannot exceed the maximum length set where the array is declared.

+
# @version ^0.3.9
+
+# Dynamic array of type uint256, max 3 elements
+nums: DynArray[uint256, 3]
+
+@external
+def __init__():
+    self.nums.append(11)
+    self.nums.append(22)
+    self.nums.append(33)
+    # This will revert (Appending to array with max 3 elements)
+    # self.nums.append(44)
+
+    # Remove last element
+    self.nums.pop()
+
+    # Delete all elements
+    self.nums = []
+    # Set values
+    self.nums = [1,2,3]
+
+
+@external
+@pure
+def examples(xs: DynArray[uint256, 5]) -> DynArray[uint256, 8]:
+    ys: DynArray[uint256, 5] = [1,2,3]
+    # Copy xs into ys
+    for x in xs:
+        ys.append(x)
+    return ys
+
+
+@external
+@pure
+def filter(addrs: DynArray[address, 5]) -> DynArray[address, 5]:
+    nonzeros: DynArray[address, 5] = []
+    for addr in addrs:
+        if addr != ZERO_ADDRESS:
+            nonzeros.append(addr)
+    return nonzeros
+
`,hy=({prev:e,next:n})=>m.jsx(z,{version:cy,title:py,description:dy,html:fy,prev:e,next:n}),my="0.3.9",yy="Error",vy="Error in Vyper",gy=`

Use assert and raise to check inputs and validate state.

+

When an error occurs, it will halt the entire function call, undoing any changes.

+

You will still need to pay gas for the failed transaction.

+
# @version ^0.3.9
+
+x: public(uint256)
+owner: public(address)
+
+
+@external
+def __init__():
+    self.owner = msg.sender
+
+
+@external
+def testAssert(x: uint256):
+    assert x >= 1, "x < 1"
+    # self.x will not be updated if there is an error from line above
+    self.x = x
+
+
+@external
+def testRaise(x: uint256):
+    # same check as above using "raise"
+    if x <= 1:
+        raise "x < 1"
+    self.x = x
+
+
+@internal
+def _testErrorBubblesUp(x: uint256):
+    assert x >= 1, "x < 1"
+    self.x = x
+
+
+@external
+def testErrorBubblesUp(x: uint256):
+    self._testErrorBubblesUp(x)
+    # self.x = 123 will not be executed if there is an error
+    # from function above
+    self.x = 123
+
+
+@external
+def setOwner(owner: address):
+    assert msg.sender == self.owner, "!owner"
+    assert owner != ZERO_ADDRESS, "owner = zero"
+    self.owner = owner
+
`,jy=({prev:e,next:n})=>m.jsx(z,{version:my,title:yy,description:vy,html:gy,prev:e,next:n}),wy="0.3.9",xy="Event",ky="Event in Vyper",_y=`

Events write logs to the blockchain, commonly used by application to monitor blockchain state and as a cheaper alternative to store data on the blockchain without using state variables.

+

Events can be efficiently searched by indexing their arguments. Up to 3 parameters can be indexed.

+
# @version ^0.3.9
+
+# up to 3 index
+event Transfer:
+    # enables quick search of all Transfer events where sender is a certain address
+    sender: indexed(address)
+    # enables quick search of all Transfer events where receiver is a certain address
+    receiver: indexed(address)
+    amount: uint256
+
+
+@external
+def transfer(receiver: address, amount: uint256):
+    # some code ...
+    log Transfer(msg.sender, receiver, amount)
+
+
+@external
+def mint(amount: uint256):
+    # some code ...
+    log Transfer(ZERO_ADDRESS, msg.sender, amount)
+
+
+@external
+def burn(amount: uint256):
+    # some code ...
+    log Transfer(msg.sender, ZERO_ADDRESS, amount)
+
`,Sy=({prev:e,next:n})=>m.jsx(z,{version:wy,title:xy,description:ky,html:_y,prev:e,next:n}),Ey="0.3.9",Cy="For Loop",Py="For loop in Vyper",Ny=`

There are 2 ways to loop through an array, using range and directly looping through array elements.

+
# @version ^0.3.9
+
+
+@external
+@pure
+def forLoop():
+    # for loop through range
+    # sum from 0 to 9
+    s: uint256 = 0
+    for i in range(10):
+        s += i
+
+    # for loop through array elements
+    # find minimum of nums
+    nums: uint256[5] = [4, 5, 1, 9, 0]
+    x: uint256 = MAX_UINT256
+    for num in nums:
+        if x < num:
+            x = num
+
+    # continue - skip current iteration
+    # break - exit for loop
+    c: uint256 = 0
+    for i in [1, 2, 3, 4, 5]:
+        # skip 2
+        if i == 2:
+            continue
+        # end loop at i = 4
+        if i == 4:
+            break
+        # otherwise increment c by 1
+        c += 1
+    # c = 2 (incremented at i = 1 and 3)
+
+
+@external
+@pure
+def sum(nums: uint256[10]) -> uint256:
+    s: uint256 = 0
+    for n in nums:
+        s += n
+    return s
+
`,Ty=({prev:e,next:n})=>m.jsx(z,{version:Ey,title:Cy,description:Py,html:Ny,prev:e,next:n}),Ly="0.3.9",Ry="Function",Oy="Function in Vyper",Iy=`
# @version ^0.3.9
+
+
+@external
+@pure
+def multiply(x: uint256, y: uint256) -> uint256:
+    return x * y
+
+
+@external
+@pure
+def divide(x: uint256, y: uint256) -> uint256:
+    return x / y
+
+
+# A funciton that does nothing
+@external
+def doNothing():
+    # pass is useful when you want to compile the contract now,
+    # write the code later
+    pass
+
+
+# Functions can return multiple outputs
+@external
+@pure
+def multiOut() -> (uint256, bool):
+    return (1, True)
+
+
+@external
+@pure
+def addAndSub(x: uint256, y: uint256) -> (uint256, uint256):
+    return (x + y, x - y)
+
`,Dy=({prev:e,next:n})=>m.jsx(z,{version:Ly,title:Ry,description:Oy,html:Iy,prev:e,next:n}),zy="0.3.9",Ay="Hash Function",Fy="Hash function in Vyper",My=`

Vyper supports the same hash function available in Solidity, keccack256.

+
# @version ^0.3.9
+
+
+@external
+@pure
+def getHash(addr: address, num: uint256, ) -> bytes32:
+    # input of keccak256 can be String, Bytes or bytes32
+    return keccak256(
+        # convert different data into Bytes
+        concat(
+            convert(addr, bytes32),
+            convert(num, bytes32),
+            convert("THIS IS A STRING", Bytes[16])
+        )
+    )
+
+
+@external
+@pure
+def getMessageHash(_str: String[100]) -> bytes32:
+    return keccak256(_str)
+
`,$y=({prev:e,next:n})=>m.jsx(z,{version:zy,title:Ay,description:Fy,html:My,prev:e,next:n}),Uy="0.3.9",by="Hello World",Vy="Hello world in Vyper",By=`

@version specifies the compiler version of Vyper.

+
# @version ^0.3.0
+
+# Create a string variable that can store maximum 100 characters
+greet: public(String[100])
+
+@external
+def __init__():
+    self.greet = "Hello World"
+
`,Hy=({prev:e,next:n})=>m.jsx(z,{version:Uy,title:by,description:Vy,html:By,prev:e,next:n}),Wy="0.3.9",Qy="If Else Conditional Statement",Ky="If else conditional statement in Vyper",Yy=`
# @version ^0.3.9
+
+
+@external
+def ifElse(x: uint256) -> uint256:
+    if x <= 10:
+        return 1
+    elif x <= 20:
+        return 2
+    else:
+        return 3
+
+
+@external
+@pure
+def absoluteValue(x: uint256, y: uint256) -> uint256:
+    if x >= y:
+        return x - y
+    return y - x
+
`,Xy=({prev:e,next:n})=>m.jsx(z,{version:Wy,title:Qy,description:Ky,html:Yy,prev:e,next:n}),Gy="0.3.9",Zy="Immutable",qy="Immutable in Vyper",Jy=`

Immutable variables are like constants except value are assigned when the contract is deployed.

+

When to use immutable variables?

+
    +
  • You have a variable that needs to be set when the contract is deployed, +for example like setting contract owner to msg.sender
    • +
  • and this variable will never change after deployment
    • +
+

Why declare variables as immutable?

+

Like constants, immutable variables save run time gas

+
# @version ^0.3.9
+
+OWNER: immutable(address)
+MY_IMMUTABLE: immutable(uint256)
+
+@external
+def __init__(_val: uint256):
+    OWNER = msg.sender
+    MY_IMMUTABLE = _val
+
+
+@external
+@pure
+def getMyImmutable() -> uint256:
+  return MY_IMMUTABLE
+
`,ev=({prev:e,next:n})=>m.jsx(z,{version:Gy,title:Zy,description:qy,html:Jy,prev:e,next:n}),nv="0.3.9",tv="Interface",sv="Interface in Vyper",rv=`

Use interface to call other smart contracts.

+

Here is the TestInterface self.contract that we will call.

+

TestInterface.vy

+
# @version ^0.3.9
+
+
+owner: public(address)
+eth: public(uint256)
+
+
+@external
+def setOwner(owner: address):
+    self.owner = owner
+
+
+@external
+@payable
+def sendEth():
+    self.eth = msg.value
+
+
+@external
+@payable
+def setOwnerAndSendEth(owner: address):
+    self.owner = owner
+    self.eth = msg.value
+

Interface.vy

+
# @version ^0.3.9
+
+
+interface TestInterface:
+    # get address of owner
+    def owner() -> address: view
+    # set new owner
+    def setOwner(owner: address): nonpayable
+    # send ETH
+    def sendEth(): payable
+    # set owner and send ETH
+    def setOwnerAndSendEth(owner: address): payable
+
+
+# store contract having the above interface
+test: public(TestInterface)
+
+
+@external
+def __init__(test: address):
+    # store contract instance
+    self.test = TestInterface(test)
+    # if you need to get address from self.test
+    addr: address = self.test.address
+
+
+@external
+@view
+def getOwner() -> address:
+    return self.test.owner()
+
+
+@external
+@view
+def getOwnerFromAddress(test: address) -> address:
+    # you can also call functions by passing in the address of the interface
+    return TestInterface(test).owner()
+
+
+@external
+def setOwner(owner: address):
+    self.test.setOwner(owner)
+
+
+@external
+@payable
+def sendEth():
+    self.test.sendEth(value=msg.value)
+
+
+@external
+@payable
+def setOwnerAndSendEth(owner: address):
+    self.test.setOwnerAndSendEth(owner, value=msg.value)
+
`,lv=({prev:e,next:n})=>m.jsx(z,{version:nv,title:tv,description:sv,html:rv,prev:e,next:n}),av="0.3.9",ov="Internal and External Functions",iv="Internal and external functions in Vyper",uv=`

@internal functions can only be called inside the contract.

+

@external functions can only be called from outside the contract.

+
# @version ^0.3.9
+
+# Internal functions can only be called inside this contract
+@internal
+@pure
+def _add(x: uint256, y: uint256) -> uint256:
+    return x + y
+
+
+@external
+@view
+def extFunc() -> bool:
+    return True
+
+
+# External functions can only be called from outside this contract
+@external
+@view
+def avg(x: uint256, y: uint256) -> uint256:
+    # cannot call other external function
+    # self.extFunc()
+
+    # can call internal functions
+    z: uint256 = self._add(x, y)
+
+    return (x + y) / 2
+
+
+@internal
+@pure
+def _sqr(x: uint256) -> uint256:
+    return x * x
+
+
+@external
+@view
+def sumOfSquares(x: uint256, y: uint256) -> uint256:
+    return self._sqr(x) + self._sqr(y)
+
`,cv=({prev:e,next:n})=>m.jsx(z,{version:av,title:ov,description:iv,html:uv,prev:e,next:n}),pv="0.3.9",dv="Payable",fv="Payable in Vyper",hv=`

Functions declared with @payable can receive Ether.

+
# @version ^0.3.9
+
+
+event Deposit:
+    sender: indexed(address)
+    amount: uint256
+
+
+@external
+@payable
+def deposit():
+    log Deposit(msg.sender, msg.value)
+
+
+@external
+@view
+def getBalance() -> uint256:
+    # Get balance of Ether stored in this contract
+    return self.balance
+
+
+owner: public(address)
+
+
+@external
+@payable
+def pay():
+    assert msg.value > 0, "msg.value = 0"
+    self.owner = msg.sender
+
`,mv=({prev:e,next:n})=>m.jsx(z,{version:pv,title:dv,description:fv,html:hv,prev:e,next:n}),yv="0.3.9",vv="Debug with Print",gv="Debug with Print",jv=`

Use the built-in function print to debug smart contracts.

+
# @version ^0.3.9
+
+@external
+def test_print():
+    x: uint256 = 123
+    # Set hardhat_compat = True when testing with Hardhat
+    print("print something here", x, hardhat_compat=True)
+
+
+
`,wv=({prev:e,next:n})=>m.jsx(z,{version:yv,title:vv,description:gv,html:jv,prev:e,next:n}),xv="0.3.9",kv="Private and Public State Variables",_v="Private and public state variables in Vyper",Sv=`

Private state variables cannot be accessed from outside the contract.

+

Public state variables can be read by anyone, including users and other contracts.

+
# @version ^0.3.9
+
+# publis state variable
+owner: public(address)
+# private state variable
+foo: uint256
+bar: public(bool)
+
+
+@external
+def __init__():
+    self.owner = msg.sender
+    self.foo = 123
+    self.bar = True
+
`,Ev=({prev:e,next:n})=>m.jsx(z,{version:xv,title:kv,description:_v,html:Sv,prev:e,next:n}),Cv="0.3.9",Pv="Raw Call",Nv="Raw call in Vyper",Tv=`

raw_call is a low level function. It is used to call and send Ether to other functions.

+

For this example, we will write a contract that calls this contract below.

+

TestRawCall.vy

+
# @version ^0.3.9
+
+
+sender: public(address)
+
+
+@external
+def testAdd(x: uint256, y: uint256) -> uint256:
+    self.sender = msg.sender
+    return x + y
+
+
+@external
+def testSub(x: uint256, y: uint256) -> uint256:
+    self.sender = msg.sender
+    return x - y
+

RawCall.vy

+
# @version ^0.3.9
+
+
+@external
+def testRawCall(to: address, x: uint256, y: uint256):
+    res: Bytes[32] = raw_call(
+        to, # address to call
+        # data to send in Bytes
+        concat(
+            method_id("testAdd(uint256,uint256)"), # function to call
+            convert(x, bytes32), # first input
+            convert(y, bytes32), # secode input
+        ),
+        max_outsize=32, # max size of ouput, default 0
+        gas=100000, # optional, amount of gas to send, default forwards all gas
+        value=0, # optional, amount of ETH to send, default 0
+    )
+
+    z: uint256 = convert(res, uint256)
+
+
+@external
+@payable
+def sendEth(to: address):
+    # Example to send ETH
+    # data = b"", empty data
+    # value = msg.value, all of ETH that was sent to this function
+    raw_call(to, b"", value=msg.value)
+
+
+diff: public(uint256)
+
+
+@external
+def testRawCallSub(to: address, x: uint256, y: uint256):
+    res: Bytes[32] = raw_call(
+        to,
+        concat(
+            method_id("testSub(uint256,uint256)"),
+            convert(x, bytes32),
+            convert(y, bytes32)
+        ),
+        max_outsize=32,
+    )
+
+    self.diff = convert(res, uint256)
+
`,Lv=({prev:e,next:n})=>m.jsx(z,{version:Cv,title:Pv,description:Nv,html:Tv,prev:e,next:n}),Rv="0.3.9",Ov="Re-Entrancy Lock",Iv="Re-entrancy lock in Vyper",Dv=`

Vyper has a handy way to secure your contract from re-entrancy.

+

A re-entrancy lock can be created on a function with @nonreentrant("lock").

+

Functions can be locked together by using the same name for the locks.

+
# @version ^0.3.9
+
+
+@external
+@nonreentrant("lock")
+def func0():
+    # call back msg.sender
+    raw_call(msg.sender, b"", value=0)
+
+
+@external
+@nonreentrant("lock-2")
+def func1():
+    raw_call(msg.sender, b"", value=0)
+
+
+@external
+@nonreentrant("lock-2")
+def func2():
+    raw_call(msg.sender, b"", value=0)
+
`,zv=({prev:e,next:n})=>m.jsx(z,{version:Rv,title:Ov,description:Iv,html:Dv,prev:e,next:n}),Av="0.3.9",Fv="Data Types - References",Mv="References in Vyper",$v=`

References types are data types that are passed by their reference, pointer to where the actual data is stored.

+
# @version ^0.3.9
+
+
+struct Person:
+    name: String[100]
+    age: uint256
+
+
+# Fixed sized list
+nums: public(uint256[10])  # must be bounded
+myMap: public(HashMap[address, uint256])
+person: public(Person)
+
+
+@external
+def __init__():
+    # This updates self.nums[0]
+    self.nums[0] = 123
+    self.nums[9] = 456
+    # Copies self.nums to array in memory.
+    # Does not modify referenced variable (self.nums)
+    arr: uint256[10] = self.nums
+    arr[0] = 123
+
+    # This updates self.myMap
+    self.myMap[msg.sender] = 1
+    self.myMap[msg.sender] = 11
+
+    # This updates self.person
+    self.person.age = 11
+    self.person.name = "Vyper"
+    # Person struct is copied into memory.
+    # Does not modify referenced variable (self.person)
+    p: Person = self.person
+    p.name = "Solidity"
+
`,Uv=({prev:e,next:n})=>m.jsx(z,{version:Av,title:Fv,description:Mv,html:$v,prev:e,next:n}),bv="0.3.9",Vv="Self Destruct",Bv="Self destruct in Vyper",Hv=`

selfdestruct deletes the contract from the blockchain. It takes a single input, an address to send all of Ether stored in the contract.

+
# @version ^0.3.9
+
+
+@external
+@payable
+def __default__():
+    pass
+
+
+@external
+def kill():
+    selfdestruct(msg.sender)
+
+
+@external
+def burn():
+    selfdestruct(ZERO_ADDRESS)
+
`,Wv=({prev:e,next:n})=>m.jsx(z,{version:bv,title:Vv,description:Bv,html:Hv,prev:e,next:n}),Qv="0.3.9",Kv="Send Ether",Yv="Send ETH in Vyper",Xv=`

There are two ways to send Ether from a contract, send and raw_call. Here we introduce the simpler function to use, send.

+
# @version ^0.3.9
+
+
+# Receive Ether into this contract
+@external
+@payable
+def __default__():
+    pass
+
+
+@external
+def sendEther(to: address, amount: uint256):
+    # when Ether is sent to a contract it will call 
+    # __default__ inside the receiving contract
+    # forwards 2300 gas
+    send(to, amount)
+
+
+@external
+def sendAll(to: address):
+    send(to, self.balance)
+
`,Gv=({prev:e,next:n})=>m.jsx(z,{version:Qv,title:Kv,description:Yv,html:Xv,prev:e,next:n}),Zv="0.3.9",qv="Unsafe Math",Jv="Unsafe math in Vyper",e0=`

Critical math checks such as overflow, underflow and division by 0 can be skipped using unsafe functions

+
# @version ^0.3.9
+
+
+@external
+def test_add(x: uint256, y: uint256) -> uint256:
+    # 21510 gas
+    # return x + y
+
+    # 21472 gas
+    return unsafe_add(x, y)
+
+
+@external
+def test_sub(x: uint256, y: uint256) -> uint256:
+    # 21533 gas
+    # return x - y
+
+    # 21495 gas
+    return unsafe_sub(x, y)
+
+
+@external
+def test_mul(x: uint256, y: uint256) -> uint256:
+    # 21578 gas
+    # return x * y
+
+    # 21520 gas
+    return unsafe_mul(x, y)
+
+
+@external
+def test_div(x: uint256, y: uint256) -> uint256:
+    # 21578 gas
+    # return x / y
+
+    # 21543 gas
+    return unsafe_div(x, y)
+
`,n0=({prev:e,next:n})=>m.jsx(z,{version:Zv,title:qv,description:Jv,html:e0,prev:e,next:n}),t0="0.3.9",s0="Data Types - Values",r0="Values in Vyper",l0=`

Some values available in Vyper

+
    +
  • bool
    • +
  • int128
    • +
  • uint256
    • +
  • decimals
    • +
  • address
    • +
  • bytes32
    • +
  • Bytes
    • +
  • String
    • +
+
# @version ^0.3.9
+
+b: public(bool)
+i: public(int128)  # -2 ** 127 to (2 ** 127 - 1)
+u: public(uint256)  # 0 to 2 ** 256 - 1
+dec: public(decimal)  # -2 ** 127 to (2 ** 127 - 1), 10 decimal places
+addr: public(address)
+b32: public(bytes32)
+bs: public(Bytes[100])
+s: public(String[100])
+
+
+@external
+def __init__():
+    self.b = False
+    self.i = -1
+    self.u = 123
+    self.dec = 3.14
+    self.addr = 0x5B38Da6a701c568545dCfcB03FcB875f56beddC4
+    self.b32 = 0xada1b75f8ae9a65dcc16f95678ac203030505c6b465c8206e26ae84b525cdacb
+    self.bs = b"\\x01"
+    self.s = "Hello Vyper"
+
`,a0=({prev:e,next:n})=>m.jsx(z,{version:t0,title:s0,description:r0,html:l0,prev:e,next:n}),o0="0.3.9",i0="Verify Signature",u0="Verify signature in Vyper",c0=`

Signing and verifying signature takes 3 steps.

+
    +
  1. Hash the data to sign. This can be done with and without a smart contract.
    2. +
  2. Sign the hash. This must be done off chain.
    3. +
  3. Verify the signature. This is done using a smart contract.
    4. +
+
# @version ^0.3.9
+
+
+# hash = getHash("Hello Vyper!")
+# 0x5436c86f18e3d25a10e557ae125450118dd0a481ca22112b1977d55a676e4c91
+@external
+@pure
+def getHash(_str: String[100]) -> bytes32:
+    return keccak256(_str)
+
+
+# getEthSignedHash(hash)
+# 0x045b623a8e8fb7b4fcfbd1ae07e7326d55303d7de4085c69b346bd130c1936da
+@external
+@pure
+def getEthSignedHash(_hash: bytes32) -> bytes32:
+    return keccak256(
+        concat(
+            b'\\x19Ethereum Signed Message:\\n32',
+            _hash
+        )
+    )
+
+
+# account = your account
+# hash = getHash("Hello Vyper!")
+# signature = await ethereum.request({ method: "personal_sign", params: [account, hash]})
+@external
+@pure
+def recoverSigner(ethSignedHash: bytes32, sig: Bytes[65]) -> address:
+    r: uint256 = convert(slice(sig, 0, 32), uint256)
+    s: uint256 = convert(slice(sig, 32, 32), uint256)
+    v: uint256 = convert(slice(sig, 64, 1), uint256)
+    return ecrecover(ethSignedHash, v, r, s)
+
+
+@external
+@pure
+def verify(sig: Bytes[65], _str: String[100], _signer: address) -> bool:
+    _hash: bytes32 = keccak256(_str)
+    ethSignedHash: bytes32 = keccak256(
+        concat(
+            b'\\x19Ethereum Signed Message:\\n32',
+            _hash
+        )
+    )
+    r: uint256 = convert(slice(sig, 0, 32), uint256)
+    s: uint256 = convert(slice(sig, 32, 32), uint256)
+    v: uint256 = convert(slice(sig, 64, 1), uint256)
+    signer: address = ecrecover(ethSignedHash, v, r, s)
+
+    return _signer == signer
+
`,p0=({prev:e,next:n})=>m.jsx(z,{version:o0,title:i0,description:u0,html:c0,prev:e,next:n}),d0="0.3.9",f0="View and Pure Functions",h0="View and pure functions in Vyper",m0=`

Both pure and view functions are read only function, they cannot write anything to the blockchain.

+

pure functions do not read any state or global variables

+

view functions can read state variables, global variables and call internal functions.

+
# @version ^0.3.9
+
+num: public(uint256)
+
+# Pure functions does not read any state or global variables
+@external
+@pure
+def pureFunc(x: uint256) -> uint256:
+    return x
+
+
+# View functions might read state or global state, or call an internal function
+@external
+@view
+def viewFunc(x: uint256) -> bool:
+    return x > self.num
+
+
+@external
+@pure
+def sum(x: uint256, y: uint256, z: uint256) -> uint256:
+    return x + y + z
+
+
+@external
+@view
+def addNum(x: uint256) -> uint256:
+    return x + self.num
+
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