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import sys
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PY2 = sys.version_info[0] == 2
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PY3 = sys.version_info[0] == 3
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if PY3:
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string_types = str, bytes
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else:
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string_types = basestring, # noqa: F821
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def with_metaclass(meta, *bases):
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"""Create a base class with a metaclass."""
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return meta("NewBase", bases, {})
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