Remove possibly redundant importlib_machinery code
#4097
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Summary of changes
Prompted by #3979 (comment) and #3979 (comment)
Removing obsolete code and workarounds benefit type-checkers.
The
importlib_machineryalias seems redundant. Maybe a leftover from old code support? If the import failed, all other usages ofimportlib_machinerywould error out anyway. With a less obviousimportlib_machineryrather than the actualImportError.It seems all
importlib.machineryusages we do here (SourceFileLoader,SourcelessFileLoaderandFileFinder) have been added in Python 3.3Pull Request Checklist
newsfragments/.(See documentation for details)