In Python3.3, I thought that every loaded module has a __loader__
attribute. Apparently this is not the case for a few builtin modules:
Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:57:17) [MSC v.1600 64
bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import importlib
>>>
>>> def bug():
... for name in list(sys.modules.keys()):
... try:
... importlib.find_loader(name)
... except Exception as details:
... print(name, type(details), details)
...
>>> bug()
_frozen_importlib <class 'AttributeError'> 'module' object has no
attribute '__loader__'
builtins <class 'AttributeError'> 'module' object has no attribute
'__loader__'
signal <class 'AttributeError'> 'module' object has no attribute
'__loader__'
importlib._bootstrap <class 'AttributeError'> 'module' object has no
attribute '__loader__'
>>>
However, the importlib docs talk about a ValueError instead of the
AttributeError that I see above:
Find the loader for a module, optionally within the specified path.
If the module is in sys.modules, then sys.modules[name].__loader__
> is returned (unless the loader would be None, in which case
> ValueError is raised).
Is this a bug?
Thomas
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