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>>> all(isinstance(dist, collections.abc.Sequence) for dist in pkgs.values())
True
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sys.path.
>>> _get_toplevel_name(PackagePath('foo.py'))
'foo'
>>> _get_toplevel_name(PackagePath('foo'))
'foo'
>>> _get_toplevel_name(PackagePath('foo.pyc'))
'foo'
>>> _get_toplevel_name(PackagePath('foo/__init__.py'))
'foo'
>>> _get_toplevel_name(PackagePath('foo.pth'))
'foo.pth'
>>> _get_toplevel_name(PackagePath('foo.dist-info'))
'foo.dist-info'
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