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[('debug', '-dbg'), ('name', 'python'), ('options', ()), ('path', '/usr/bin/'), ('version', '3.2')]
>>> sorted(Interpreter.parse('#! /usr/bin/python3.2').items())
[('debug', None), ('name', 'python'), ('options', ()), ('path', '/usr/bin/'), ('version', '3.2')]
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>>> i.sitedir(version='2.5')
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'/usr/lib/python2.7/dist-packages/'
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>>> i.cache_file('foo.py', Version('3.1'))
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