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mimetypes.guess_extension : AttributeError: 'NoneType' object has no attribute 'lower' #96264
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Description
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
ericvsmith commentedon Aug 25, 2022
Your
filenameIs probablyNone. 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.zware commentedon Aug 25, 2022
mimetypes.guess_typeis documented to returnNonefor the type portion of its return tuple when the type cannot be guessed, andmimetypes.guess_all_extensions(and, thereby,mimetypes.guess_extension) expects astrtype argument. There's no bug in themimetypesmodule here.You could work around this by using
mimetypes.guess_extension(mimetypes.guess_type(filename)[0] or '').