Скачать или смотреть How to Solve the ModuleNotFoundError When Using Flask-Script

Learn how to fix the `ModuleNotFoundError: No module named 'flask._compat'` when using Flask-Script by downgrading Flask or using built-in Flask commands.
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This video is based on the question https://stackoverflow.com/q/67538056/ asked by the user 'moreno_asi' ( https://stackoverflow.com/u/15927785/ ) and on the answer https://stackoverflow.com/a/67543037/ provided by the user 'Ashutosh Krishna' ( https://stackoverflow.com/u/13896289/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Solving the ModuleNotFoundError in Flask-Script

When working with Flask and Flask-Script, developers may encounter various errors that halt their progress. One such issue is the dreaded ModuleNotFoundError: No module named 'flask._compat'. If you’ve installed Flask and Flask-Script but find that you cannot import Manager, you’re not alone. This guide will provide a comprehensive solution to this problem to get you back on track.

Understanding the Problem

The error you are facing typically occurs because of a compatibility issue between the version of Flask you are using and Flask-Script. As of Flask 2.0.0, some modules, including flask._compat, have been removed, leading to this error when Flask-Script attempts to access them.

Solution Steps

Here are two primary ways to resolve the issue:

Option 1: Downgrade Flask

One straightforward way to fix the error is to downgrade your Flask version to one that is compatible with Flask-Script. Specifically, you should downgrade to Flask 1.1.2. Here’s how to do it:

Open your terminal. Make sure you are in your project's virtual environment.

Run the following command:

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

After the installation completes, try running your Flask application again. Your issue with importing Manager should now be resolved!

Option 2: Use Built-in Flask Commands

If you'd prefer not to downgrade Flask or if you want to move on from Flask-Script altogether, you can utilize the built-in Flask commands that modern Flask installations provide. This is a recommended approach, as Flask-Script is considered somewhat outdated. Here’s a list of commands you can use:

To initialize the database:

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

To apply new migrations:

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

To upgrade the database:

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

By using these commands, you can manage your Flask application effectively without the need for Flask-Script.

Conclusion

Encountering the ModuleNotFoundError: No module named 'flask._compat' can be frustrating, but now you know how to resolve it. Either downgrade your Flask version to 1.1.2 to remain compatible with Flask-Script or transition to using the built-in Flask commands for database management. Either solution should help you get back on track and continue developing your application with ease.

Happy coding!