Скачать или смотреть Resolving the python 3.7 venv Issues After Upgrading to Ubuntu 20.04

Are you struggling with your Python virtual environment after upgrading to Ubuntu 20.04? Follow our detailed guide to restore Python 3.7 in your project.
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Fixing Python 3.7 Virtual Environment Issues After Upgrading to Ubuntu 20.04

Upgrading your operating system can often bring a wealth of new features and improvements. However, it can also lead to unexpected challenges, especially when dealing with programming environments. If you've recently upgraded to Ubuntu 20.04, you might have encountered an issue with your Python virtual environment (venv). Specifically, you may notice that your Python 3.7 environment no longer works as intended, and the Python 3.8 version seems to have taken over.

In this guide, we will address this common problem and provide a clear, step-by-step guide on how to restore your Python 3.7 virtual environment successfully.

Understanding the Problem

After upgrading to Ubuntu 20.04, many users find that their previously configured Python virtual environments do not activate correctly. The main symptoms include:

The virtual environment activates but defaults to Python 3.8 instead of 3.7.

Python 3.7 appears to be missing from the system, causing applications and projects that depend on it to fail.

Luckily, there is a solution that allows you to restore Python 3.7 without having to upgrade all of your packages.

Step-by-Step Solution

Follow these steps to resolve the issues with your Python 3.7 virtual environment:

1. Reinstall Python 3.7

The first step is to ensure that Python 3.7 is installed on your system. With Ubuntu’s upgrade, it is possible that Python 3.7 was removed. You can quickly add it back by opening your terminal and executing the following commands:

[[See Video to Reveal this Text or Code Snippet]]

This will install Python 3.7 using a repository that provides older Python versions.

2. Modify Your Virtual Environment Configuration

Next, you need to modify the virtual environment’s configuration file to point to the reinstalled version of Python. Navigate to your virtual environment directory (e.g., env/) and find the pyenv.cfg file. Open it in your preferred text editor and change the last line to ensure it reads:

[[See Video to Reveal this Text or Code Snippet]]

This adjustment tells the virtual environment to use Python 3.7.

3. Update the Python Symlink

To finalize the adjustment, you must update the symbolic link for Python within the env/bin directory. Run the following command in the terminal:

[[See Video to Reveal this Text or Code Snippet]]

This command creates a new link pointing to Python 3.7, effectively overriding the previous symlink that pointed to Python 3.8. If there's already a symlink there, you may need to delete the old one before creating the new link.

[[See Video to Reveal this Text or Code Snippet]]

4. Activation Verification

After completing the above steps, try activating your virtual environment again. Use the command:

[[See Video to Reveal this Text or Code Snippet]]

If everything is correctly set up, the Python interpreter should now reflect the version 3.7, and your project should work as expected.

Conclusion

Upgrading to Ubuntu 20.04 shouldn’t spell disaster for your Python projects. By following these straightforward steps, you can quickly restore your Python 3.7 virtual environment and keep your development process on track. This solution provides a practical approach without overwhelming you with the need to update all other packages, which may not be desired.

If you have any further questions or encounter issues, feel free to share your comments below. Happy coding!