Added azure native function app in python (#1002)

Added azure native function app in python
```
          Type                                     Name                        Status
     +   pulumi:pulumi:Stack                      azure-py-functions-dev      created
     +   ├─ azure-native:resources:ResourceGroup  resourcegroup_functions_py  created
     +   ├─ azure-native:web:AppServicePlan       consumption-plan            created
     +   ├─ azure-native:storage:StorageAccount   storageaccount              created
     +   └─ azure-native:web:WebApp               functionapp                 created
    
    Outputs:
        consumptionplan        : "consumption-plan2e4262cf"
        endpoint               : "https://functionappd8d431c1.azurewebsites.net/api/HelloWithPython"
        function_app           : "functionappd8d431c1"
        primarystoragekey      : "[secret]"
        resourcegroup          : "resourcegroup_functions_pyb8aff58c"
        storageaccount         : "storageaccount6a453652"
        storageaccountkeys     : "[secret]"
        storageconnectionstring: "[secret]"
 ```
    
    curl "$(pulumi stack output endpoint)"
    Hello from Python in Pulumi! You have stood up a serverless function in Azure!

---------

Co-authored-by: Richard Shade <[email protected]>

azure-py-functions/.gitignore

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+*.pyc
+venv/

azure-py-functions/.vscode/settings.json

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+{
+    "python.pythonPath": "venv/bin/python"
+}

azure-py-functions/Pulumi.yaml

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+name: azure-py-functions
+runtime:
+  name: python
+  options:
+    virtualenv: venv
+description: A minimal Azure Native Function in Python with Pulumi program

azure-py-functions/README.md

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+# Deploying Serverless Applications with Azure Functions
+
+You will deploy a Azure Function Apps with HTTP-triggered serverless functions in python
+
+## Running the App
+
+1.  Login to Azure CLI (you will be prompted to do this during deployment if you forget this step):
+
+    ```
+    $ az login
+    ```
+
+1.  Create a new stack:
+
+    ```
+    $ pulumi stack init dev
+    ```
+
+
+1. Create a virtual environment and install python dependencies
+
+    ### Windows
+    Run the following command to create a virtual environment
+    ```bash
+    python -m venv venv
+    ```
+
+    Activate the environment:
+    ```bash
+    venv\Scripts\activate
+    ```
+
+    Install dependencies:
+    ```bash
+    pip3 install -r requirements.txt
+    ```
+    ### Mac and Linux
+    Run the following command to create a virtual environment
+    ```bash
+    python3 -m venv venv
+    ```
+
+    Activate the environment:
+    ```bash
+    source venv/bin/activate
+    ```
+
+    Install dependencies:
+    ```bash
+    pip3 install -r requirements.txt
+    ```
+
+    At this point, dependencies will be installed into your virtual environment. **If you close your terminal at any time**, you may need to re-activate the environment:
+    ```bash
+    source venv/bin/activate
+    ```
+
+1.  Configure the location to deploy the resources to.  The Azure region to deploy to is pre-set to **WestUS** - but you can modify the region you would like to deploy to.
+
+    ```bash
+    pulumi config set azure-native:location eastus2
+    ```
+
+    [pulumi config set](https://www.pulumi.com/docs/reference/cli/pulumi_config_set/) allows us to pass in [configuration values](https://www.pulumi.com/docs/intro/concepts/config/#setting-and-getting-configuration-values) from the command line.
+    Feel free to choose any Azure region that supports the services used in these labs ([see this infographic](https://azure.microsoft.com/en-us/global-infrastructure/regions/) for current list of available regions).  A list of some of the regions:
+
+    ```
+    centralus,eastasia,southeastasia,eastus,eastus2,westus,westus2,northcentralus,southcentralus,
+    westcentralus,northeurope,westeurope,japaneast,japanwest,brazilsouth,australiasoutheast,australiaeast,
+    westindia,southindia,centralindia,canadacentral,canadaeast,uksouth,ukwest,koreacentral,koreasouth,
+    francecentral,southafricanorth,uaenorth,australiacentral,switzerlandnorth,germanywestcentral,
+    norwayeast,jioindiawest,australiacentral2
+    ```
+
+    The command updates and persists the value to the local `Pulumi.dev.yaml` file. You can view or edit this file at any time to effect the configuration of the current stack.
+
+1. Azure Python Function Zip file
+   The applications settings configure the app to run on Python3 deploy the specified zip file to the Function App. The app will download the specified file, extract the code from it, discover the functions, and run them. We’ve prepared this [zip](https://github.com/tusharshahrs/demo/blob/main/content/lab/pulumi/azure-native/python/app/HelloWithPython.zip) file for you to get started faster, you can find its code [here](https://github.com/tusharshahrs/demo/tree/main/content/lab/pulumi/azure-native/python/app). The code contains a single HTTP-triggered Azure Function.
+
+1. Run `pulumi up` to preview and select `yes` to deploy changes:
+
+    ```
+    $ pulumi up
+    Previewing update (dev)
+
+    View Live: https://app.pulumi.com/myuser/azure-py-functions/dev/previews/f3ea-2esdff2-123d-e79d
+
+        Type                                     Name                        Plan       
+    +   pulumi:pulumi:Stack                      azure-py-functions-dev      create     
+    +   ├─ azure-native:resources:ResourceGroup  resourcegroup_functions_py  create     
+    +   ├─ azure-native:web:AppServicePlan       consumption-plan            create     
+    +   ├─ azure-native:storage:StorageAccount   storageaccount              create     
+    +   └─ azure-native:web:WebApp               functionapp                 create     
+    
+    Resources:
+        + 5 to create
+
+    Do you want to perform this update?  [Use arrows to move, enter to select, type to filter]
+    > yes
+      no
+      details
+
+    Updating (dev)
+
+    View Live: https://app.pulumi.com/myuser/azure-py-functions/dev/updates/1
+
+        Type                                     Name                        Status      
+    +   pulumi:pulumi:Stack                      azure-py-functions-dev      created     
+    +   ├─ azure-native:resources:ResourceGroup  resourcegroup_functions_py  created     
+    +   ├─ azure-native:web:AppServicePlan       consumption-plan            created     
+    +   ├─ azure-native:storage:StorageAccount   storageaccount              created     
+    +   └─ azure-native:web:WebApp               functionapp                 created     
+    
+    Outputs:
+        consumptionplan        : "consumption-plan7b9df5ed"
+        endpoint               : "https://functionappfe054af4.azurewebsites.net/api/HelloWithPython"
+        function_app           : "functionappfe054af4"
+        primarystoragekey      : "[secret]"
+        resourcegroup          : "resourcegroup_functions_py4eba2bf2"
+        storageaccount         : "storageaccounta6b2e431"
+        storageaccountkeys     : "[secret]"
+        storageconnectionstring: "[secret]"
+
+    Resources:
+        + 5 created
+
+    Duration: 50s
+    ```
+
+1.  Check the deployed function endpoints via [pulumi stack output](https://www.pulumi.com/docs/reference/cli/pulumi_stack_output/)
+
+    ```
+    $ pulumi stack output endpoint
+      https://functionappfe054af4.azurewebsites.net/api/HelloWithPython
+
+1. You can now open the resulting endpoint in the browser or curl it:
+   ```
+    $ curl "$(pulumi stack output endpoint)"
+    Hello from Python in Pulumi! You have stood up a serverless function in Azure!
+    ```
+
+## Cleanup and destroy everything
+
+1. Destroy the stack via: `pulumi destroy`   .Select `yes`
+   ```
+   Previewing destroy (dev)
+
+        Type                                     Name                        Plan       
+    -   pulumi:pulumi:Stack                      azure-py-functions-dev      delete     
+    -   ├─ azure-native:web:WebApp               functionapp                 delete          
+     ..
+     ..  
+
+    Outputs:
+      - endpoint               : "https://functionappfe054af4.azurewebsites.net/api/HelloWithPython"
+      ..
+      ..
+
+    Resources:
+        - 5 to delete
+
+    Do you want to perform this destroy?  [Use arrows to move, enter to select, type to filter]
+      yes
+    > no
+      details
+    ..
+    ..
+    Resources:
+    - 5 deleted
+
+    Duration: 1m1s  
+   ```
+
+1. Remove the stack
+
+    ```
+    pulumi stack rm
+    This will permanently remove the 'dev' stack!
+    Please confirm that this is what you'd like to do by typing ("dev"): 
+    ```
+
+    Type in the name of your stack:  **dev**

azure-py-functions/__main__.py

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+import pulumi
+from pulumi_azure_native import resources
+from pulumi_azure_native import storage
+from pulumi_azure_native import web
+from pulumi import Output
+
+# Create an Azure Resource Group
+resource_group = resources.ResourceGroup('resourcegroup_functions_py')
+
+# Create a Storage Account
+account = storage.StorageAccount(
+    'storageaccount',
+    resource_group_name=resource_group.name,
+    sku=storage.SkuArgs(
+        name=storage.SkuName.STANDARD_LRS,
+    ),
+    kind=storage.Kind.STORAGE_V2,
+)
+
+# Create a consumption plan
+# Consumption plan must be linux for python: https://docs.microsoft.com/en-us/azure/azure-functions/functions-scale#operating-systemruntime
+plan = web.AppServicePlan(
+    "consumption-plan",
+    resource_group_name=resource_group.name,
+    location=resource_group.location,
+    kind="functionapp",
+    reserved=True,  # This is an Azure Requirement for PYTHON. The function can only run on Linux.
+    sku=web.SkuDescriptionArgs(name="Y1", tier="Dynamic", size="Y1", family="Y", capacity=0),
+)
+
+# Export the Azure Resource Group
+pulumi.export('resourcegroup', resource_group.name)
+
+# Export the Storage Account
+pulumi.export('storageaccount', account.name)
+
+# Export the Consumption Plan
+pulumi.export('consumptionplan', plan.name)
+
+# List of storage account keys
+storageAccountKeys = pulumi.Output.all(resource_group.name, account.name).apply(
+    lambda args: storage.list_storage_account_keys(
+        resource_group_name=args[0], account_name=args[1]
+    )
+)
+# Primary storage account key
+primaryStorageKey = storageAccountKeys.apply(lambda accountKeys: accountKeys.keys[0].value)
+# Build a storage connection string out of it:
+storageConnectionString = Output.concat(
+    "DefaultEndpointsProtocol=https;AccountName=", account.name, ";AccountKey=", primaryStorageKey
+)
+
+
+# Export the storageacountkey as a secret
+pulumi.export("storageaccountkeys", pulumi.Output.secret(storageAccountKeys))
+# Export the primarystoragekey as a secret
+pulumi.export('primarystoragekey', pulumi.Output.secret(primaryStorageKey))
+# Export the storageconnectionstring  as a secret
+pulumi.export('storageconnectionstring', pulumi.Output.secret(storageConnectionString))
+
+# Create the functionapp
+app = web.WebApp(
+    "functionapp",
+    resource_group_name=resource_group.name,
+    location=resource_group.location,
+    kind="functionapp",
+    reserved=True,
+    server_farm_id=plan.id,
+    site_config=web.SiteConfigArgs(
+        app_settings=[
+            web.NameValuePairArgs(name="runtime", value="python"),
+            web.NameValuePairArgs(name="FUNCTIONS_WORKER_RUNTIME", value="python"),
+            web.NameValuePairArgs(name="FUNCTIONS_EXTENSION_VERSION", value="~3"),
+            web.NameValuePairArgs(name="AzureWebJobsStorage", value=storageConnectionString),
+            web.NameValuePairArgs(
+                name="WEBSITE_RUN_FROM_PACKAGE",
+                value="https://github.com/pulumi/examples/raw/master/azure-py-functions/app/HelloWithPython.zip",
+            ),
+        ],
+    ),
+)
+
+# Export the function
+pulumi.export('function_app', app.name)
+
+# Full endpoint of your Function App
+function_endpoint = app.default_host_name.apply(
+    lambda default_host_name: f"https://{default_host_name}/api/HelloWithPython"
+)
+pulumi.export('endpoint', function_endpoint)

azure-py-functions/app/HelloWithPython/__init__.py

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+import logging
+
+import azure.functions as func
+
+
+def main(req: func.HttpRequest) -> func.HttpResponse:
+    logging.info('Python HTTP trigger function processed a request.')
+    return func.HttpResponse(
+        f"Hello from Python in Pulumi! You have stood up a serverless function in Azure!"
+    )

azure-py-functions/app/HelloWithPython/function.json

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+{
+  "scriptFile": "__init__.py",
+  "bindings": [
+    {
+      "authLevel": "anonymous",
+      "type": "httpTrigger",
+      "direction": "in",
+      "name": "req",
+      "methods": [
+        "get",
+        "post"
+      ]
+    },
+    {
+      "type": "http",
+      "direction": "out",
+      "name": "$return"
+    }
+  ]
+}