Description

HGStyle

opened on Aug 25, 2022

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Hi, when i call the function "guess_extension" from the mimetypes module, i get an error :

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/hg/Bureau/ezConverter/module.py", line 14, in getRealExtension
    currentext = mime.guess_extension(x[0])
  File "/usr/lib/python3.9/mimetypes.py", line 326, in guess_extension
    return _db.guess_extension(type, strict)
  File "/usr/lib/python3.9/mimetypes.py", line 192, in guess_extension
    extensions = self.guess_all_extensions(type, strict)
  File "/usr/lib/python3.9/mimetypes.py", line 171, in guess_all_extensions
    type = type.lower()
AttributeError: 'NoneType' object has no attribute 'lower'

I dont think it's my code. But it is here :

import mimetypes as mime
def getRealExtension(filename):
    x = mime.guess_type(filename)
    currentext = mime.guess_extension(x[0])
# I import it to the shell and call the function.

Thanks in advance !

Activity

1. HGStyle

   added

   type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

   on Aug 25, 2022
2. ericvsmith commented on Aug 25, 2022

   

   ericvsmith

   on Aug 25, 2022

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   Your filename Is probably None. If you can provide a small, complete example that we can run then we can take a look at it, otherwise not much we can do.

   Reacted by Zachary Ware
3. zware

   added

   pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

   on Aug 25, 2022
4. zware commented on Aug 25, 2022

   

   zware

   on Aug 25, 2022

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   mimetypes.guess_type is documented to return None for the type portion of its return tuple when the type cannot be guessed, and mimetypes.guess_all_extensions (and, thereby, mimetypes.guess_extension) expects a str type argument. There's no bug in the mimetypes module here.

   You could work around this by using mimetypes.guess_extension(mimetypes.guess_type(filename)[0] or '').
5. zware

   closed this as not plannedon Aug 25, 2022
6. zware

   removed

   pendingThe issue will be closed if no feedback is providedThe issue will be closed if no feedback is provided

   on Aug 25, 2022

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