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Showing content from https://github.com/Azure-Samples/python-worker-extension-timer below:

Azure-Samples/python-worker-extension-timer: Sample repository to demonstrate how to publish a Python worker extension for Azure Functions

This is an example repo to demonstrate how to build a Python Worker extension in Azure Functions.

This project framework provides the following features:

• Calculate the time elapsed in every HTTP triggers
• Overwrite the HTTP response from your function to display the elapsed time.

• Python 3.7 or above. To check the full list of supported Python versions in Azure Functions, see the Python developer guide.
• The Azure Functions Core Tools, version 4.0.5095 or later to support v2 Python programming model.
• Visual Studio Code installed on one of the supported platforms.

1. Open a Windows PowerShell or any Linux shell as you prefer.
2. Change your directory into the _example/
3. Create a Python virtual environment by py -m venv .venv in Windows, or python3 -m venv .venv in Linux.
4. Activate the Python virutal environment with .venv\Scripts\Activate.ps1 in Windows PowerShell or source .venv/bin/activate in Linux shell.
5. Install the packages for your function app project pip install -r requirements.txt
6. Start the function host with func host start --verbose

You should now be able to access http://localhost:7071/api/HttpTrigger. Each http response reports the time elapsed of processing the request.

To install this Python worker extension package in an existing function app:

• Add a VCS URL in your requirements.txt git+https://github.com/Azure-Samples/python-worker-extension-timer
• Run pip install -r requirements.txt
• In your FunctionApp/HttpTrigger, add the following lines to enable this feature:

from python_worker_extension_timer import TimerExtension
TimerExtension.configure(append_to_http_response=True)

In the v1 programming model, add the lines in the __init.py__ file. In the v2 programming model, add the lines in the function_app.py file.

• Develop Python worker extensions for Azure Functions

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