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>>> same_path("a/b", "./a/b")
True
>>> same_path("a/b", "a/./b")
True
>>> same_path("a/b", "././a/b")
True
>>> same_path("a/b", "./a/b/c/..")
True
>>> same_path("a/b", "../a/b/c")
False
>>> same_path("a", "a/b")
False
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Add the indicated paths to the head of the PYTHONPATH environment
variable so that subprocesses will also see the packages at
these paths.
Do this in a context that restores the value on exit.
>>> getfixture('monkeypatch').setenv('PYTHONPATH', 'anything')
>>> with paths_on_pythonpath(['foo', 'bar']):
... assert 'foo' in os.environ['PYTHONPATH']
... assert 'anything' in os.environ['PYTHONPATH']
>>> os.environ['PYTHONPATH']
'anything'
>>> getfixture('monkeypatch').delenv('PYTHONPATH')
>>> with paths_on_pythonpath(['foo', 'bar']):
... assert 'foo' in os.environ['PYTHONPATH']
>>> os.environ.get('PYTHONPATH')
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