Error when running within Flask application

[bb78657]

Error when running within Flask application

[amcgregor]

It does not appear that Werkzeug's reloader is compatible with marrow.mongo. Specifically, Marrow Mongo populates two "virtual namespace packages" (marrow.mongo.field, marrow.mongo.document) which are not actually real on-disk packages (no __init__.py for them). Because they are not backed by on-disk files, those virtual modules do not have a __file__ attribute, which Werkzeug can't handle.

[j-solis]

This is happening in the latest django for me

[amcgregor]

Closing as insufficient information is provided to reproduce.

LookupError: Unknown plugin "__file__"…

This is not an attribute access that occurs under my installation, and the Python version in question is now quite old. Feel free to re-open if reproducible under Python 3.8 or newer and without "live reloading" enabled.

  File "/home/user/.virtualenvs/myapp/lib/python3.5/site-packages/werkzeug/_reloader.py", line 263, in run_with_reloader
    reloader.run()
  File "/home/user/.virtualenvs/myapp/lib/python3.5/site-packages/werkzeug/_reloader.py", line 144, in run
    self.extra_files):
  File "/home/user/.virtualenvs/myapp/lib/python3.5/site-packages/werkzeug/_reloader.py", line 22, in _iter_module_files
    filename = getattr(module, '__file__', None)

This segment of traceback clearly implicates the "live reloading" functionality. Python, as a language, does not have this as a feature. I always recommend use of an external file monitoring and process management tool, such as entr. (I use this for all of my "watch files and do" needs, such as SCSS recompilation, development web service restarting, browser tab reloading, &c.)