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- # encoding: utf-8
- """
- This module provides compatibility between Python 2 and 3. Hardly
- anything is used by this project to constitute including `six`_.
- .. _`six`: http://pythonhosted.org/six
- """
- import sys
- if sys.version_info[0] < 3:
- # Python 2.
- unicode = unicode
- string_types = (basestring,)
- from collections import Iterable
- from itertools import izip_longest
- def iterkeys(mapping):
- return mapping.iterkeys()
- else:
- # Python 3.
- unicode = str
- string_types = (unicode,)
- from collections.abc import Iterable
- from itertools import zip_longest as izip_longest
- def iterkeys(mapping):
- return mapping.keys()
- try:
- # Python 3.6+.
- from collections.abc import Collection
- except ImportError:
- # Python 2.7 - 3.5.
- from collections import Container as Collection
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