Brett Cannon added the comment:

I just realized that there is no way to make ModuleSpec.has_location return 
True if the spec is created by simply instantiating ModuleSpec. As it stands 
now you **must** go through importlib.util.spec_from_file_location(), which 
makes it not a helper but a **required** API to use. I think this is the only 
thing that cannot be stated directly through ModuleSpec instantiation or public 
attribute assignment.

This means either (a) the docs on ModuleSpec need to be **very** clear that you 
must use spec_from_file_location() to make spec.has_location be true, (b) add 
another keyword-only argument to ModuleSpec.__init__(), or (c) make 
has_location settable (e.g. be able to only set it to True/False or 
alternatively assigning it sets both has_location to True and origin to the 
assigned value).

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue18864>
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