"""Python compatible module."""
import sys

_IS_PYTHON_3 = (sys.version_info[0])

identity = lambda x: x


# u('string') replaces the forwards-incompatible u'string'
if _IS_PYTHON_3:
    u = identity
else:
    import codecs

    def u(string):
        """U string."""
        return codecs.unicode_escape_decode(string)[0]


# dict.iteritems(), dict.iterkeys() is also incompatible
if _IS_PYTHON_3:
    iteritems = dict.items
    iterkeys = dict.keys
else:
    iteritems = dict.iteritems
    iterkeys = dict.iterkeys