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Is it the case that given a filename, it might be possible to load a module even if open(filename) fails?
I think the logic is clearer in the form where it is not pulled out into a separate helper function. You can avoid the double check on the extension by doing:
 if filename.endswith(importlib.machinery.BYTECODE_SUFFIXES):
 loader = importlib.machinery.SourcelessFileLoader('__temp__',
 filename)
 elif filename.endswith(importlib.machinery.EXTENSION_SUFFIXES):
 loader = importlib.machinery.ExtensionFileLoader('__temp__',
 filename)
 else:
 loader = None
 if loader:
 xxxxx
 else:
 xxxxx