1733 add lambda instance assignment violation #1911

AlexandrKhabarov · 2021-02-25T16:48:10Z

I have made things!

Checklist

I have double checked that there are no unrelated changes in this pull request (old patches, accidental config files, etc)
I have created at least one test case for the changes I have made
I have updated the documentation for the changes I have made
I have added my changes to the CHANGELOG.md

AlexandrKhabarov · 2021-02-25T17:30:10Z

@sobolevn
Hello, Nikita!
Can you look at my request?

sobolevn

Thanks a lot! Great work! So many awesome features!

I have several things I want to discuss:

What do you think about cls. attribute assignment?
What do you think about class Some: a = lambda: ...?

sobolevn · 2021-02-25T22:34:11Z

tests/test_visitors/test_ast/test_classes/test_instance_assignment.py

+instance_lambda_assignment = """
+class Example(object):
+    def __init__(self):
+        self._attr = lambda: ...


We need to make this _attr thing here parametrized.
We need to check: attr, _attr, and __attr

We also need to parametrize self part.
We need to check: self, cls, mcs, other

sobolevn · 2021-02-25T22:34:59Z

wemake_python_styleguide/violations/best_practices.py

+       example.callback(1) will look like a method, but it is not a method.
+
+    Solution:
+        To forbid lambda assignment in instance attributes.


Do not assign lambda functions to attributes, create real methods.

sobolevn · 2021-02-25T22:35:37Z

wemake_python_styleguide/violations/best_practices.py

+
+    Reasoning:
+       This will be very tricky to understand for users.
+       example.callback(1) will look like a method, but it is not a method.


example.callback(1)

but it is not really a method

sobolevn · 2021-02-25T22:38:08Z

Closes #1733

sobolevn · 2021-02-25T22:39:34Z

@AlexandrKhabarov please, don't forget to use closes #x in your PRs, so our automation will link them to original issues 🙂

AlexandrKhabarov · 2021-02-26T07:41:14Z

Yeah, I think, it is a good point to check assignments to class instance too. I'll add it.

codecov · 2021-03-02T14:41:20Z

Codecov Report

Merging #1911 (1e0f252) into master (8f72647) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##            master     #1911    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files          115       119     +4     
  Lines         6145      6258   +113     
  Branches      1375      1393    +18     
==========================================
+ Hits          6145      6258   +113

Impacted Files	Coverage Δ
...ake_python_styleguide/logic/complexity/overuses.py	`100.00% <ø> (ø)`
wemake_python_styleguide/presets/types/tree.py	`100.00% <ø> (ø)`
wemake_python_styleguide/visitors/ast/blocks.py	`100.00% <ø> (ø)`
wemake_python_styleguide/logic/tree/annotations.py	`100.00% <100.00%> (ø)`
wemake_python_styleguide/logic/tree/assignments.py	`100.00% <100.00%> (ø)`
wemake_python_styleguide/logic/tree/decorators.py	`100.00% <100.00%> (ø)`
wemake_python_styleguide/logic/tree/functions.py	`100.00% <100.00%> (ø)`
...ake_python_styleguide/violations/best_practices.py	`100.00% <100.00%> (ø)`
wemake_python_styleguide/visitors/ast/classes.py	`100.00% <100.00%> (ø)`
wemake_python_styleguide/visitors/ast/compares.py	`100.00% <100.00%> (ø)`
... and 10 more

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Powered by Codecov. Last update 8f72647...8f6c965. Read the comment docs.

AlexandrKhabarov · 2021-03-02T14:42:24Z

@sobolevn
Hello, Nikita?
Can you review my request?

sobolevn

Thanks a lot, @AlexandrKhabarov!
As always, great work! 👍

sobolevn · 2021-03-02T14:47:56Z

wemake_python_styleguide/logic/tree/assignments.py

+    return flatten_nodes
+
+
+def get_assignments(node: ast.ClassDef) -> _AllAssignments:


This function is really similar to https://github.com/wemake-services/wemake-python-styleguide/blob/master/wemake_python_styleguide/logic/tree/classes.py#L76

Can you please explain, why can't we reuse it?

I wrote another one function for finding assignments only.
This one finds assignments for classes and attributes for instances and I decided to unify returned values for lambda assignment violations.

I agree that both functions are similar and I need to think about how to decreases code duplication.

sobolevn · 2021-03-02T14:48:58Z

tests/test_visitors/test_ast/test_classes/test_instance_assignment.py

+    AttributesAssignmentVisitor,
+)
+
+instance_lambda_assignment = """


We also need cls template:

""" class Example(object): @classmethod def some(cls): {0} """

…ents

AlexandrKhabarov · 2021-03-08T15:00:16Z

@sobolevn
Hello Nikita!
I decreased code duplication and write one more tests for class lamda assignment.
Can you review my request?

sobolevn

Thanks a lot! The progress is looking great! 👍

Please, rebase your PR on master, since now it has some conflicts.

sobolevn · 2021-03-10T09:25:11Z

wemake_python_styleguide/logic/tree/classes.py

+            isinstance(target, ast.Attribute) and
+            isinstance(target.ctx, ast.Store) and
+            isinstance(target.value, ast.Name) and
+            target.value.id in constants.SPECIAL_ARGUMENT_NAMES_WHITELIST


This is not correct, because constants.SPECIAL_ARGUMENT_NAMES_WHITELIST also has mcs and cls, so it can catch non-self assigns.

sobolevn · 2021-03-10T09:25:56Z

wemake_python_styleguide/visitors/ast/blocks.py

@@ -76,7 +76,7 @@ class BlockVariableVisitor(base.BaseNodeVisitor):
    )

    _scope_predicates: Tuple[_ScopePredicate, ...] = (
-        lambda node, names: predicates.is_property_setter(node),
+        lambda node, names: predicates.is_property_setter(node),  # noqa: WPS467


This should be ignored, because here we assign Tuple and not lambda.

We should test it explicitly.

sobolevn requested changes Feb 25, 2021

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sobolevn linked an issue Feb 25, 2021 that may be closed by this pull request

Forbid assigning lambda to object properties #1733

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AlexandrKhabarov force-pushed the issue-1733 branch 3 times, most recently from 11e1d7f to f9c36c5 Compare February 26, 2021 07:27

1733 add lambda instance assignment violation

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AlexandrKhabarov force-pushed the issue-1733 branch from f9c36c5 to 9af8176 Compare February 26, 2021 07:38

AlexandrKhabarov force-pushed the issue-1733 branch 13 times, most recently from 9bbf386 to 2de3cdf Compare March 2, 2021 14:24

1733 add lambda class assignment violation

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AlexandrKhabarov force-pushed the issue-1733 branch from f534c8c to 924525d Compare March 8, 2021 14:32

AlexandrKhabarov force-pushed the issue-1733 branch 2 times, most recently from db6c466 to 14b498c Compare March 8, 2021 14:45

1733 return only assignments and rename get_attributes to get_assignm…

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…ents

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1733 add lambda instance assignment violation #1911

1733 add lambda instance assignment violation #1911

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		return flatten_nodes


		def get_assignments(node: ast.ClassDef) -> _AllAssignments:

1733 add lambda instance assignment violation #1911

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1733 add lambda instance assignment violation #1911

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AlexandrKhabarov commented Feb 25, 2021

I have made things!

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