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A selection of cross-compatible functions for Python 2 and 3.

This module exports useful functions for 2/3 compatible code:

    * bind_method: binds functions to classes
    * ``native_str_to_bytes`` and ``bytes_to_native_str``
    * ``native_str``: always equal to the native platform string object
(because
      this may be shadowed by imports from future.builtins)
    * lists: lrange(), lmap(), lzip(), lfilter()
    * iterable method compatibility:
        - iteritems, iterkeys, itervalues
        - viewitems, viewkeys, viewvalues

        These use the original method if available, otherwise they use
items,
        keys, values.

    * types:

        * text_type: unicode in Python 2, str in Python 3
        * string_types: basestring in Python 2, str in Python 3
        * binary_type: str in Python 2, bytes in Python 3
        * integer_types: (int, long) in Python 2, int in Python 3
        * class_types: (type, types.ClassType) in Python 2, type in Python
3

    * bchr(c):
        Take an integer and make a 1-character byte string
    * bord(c)
        Take the result of indexing on a byte string and make an integer
    * tobytes(s)
        Take a text string, a byte string, or a sequence of characters
taken
        from a byte string, and make a byte string.

    * raise_from()
    * raise_with_traceback()

This module also defines these decorators:

    * ``python_2_unicode_compatible``
    * ``with_metaclass``
    * ``implements_iterator``

Some of the functions in this module come from the following sources:

    * Jinja2 (BSD licensed: see
      https://github.com/mitsuhiko/jinja2/blob/master/LICENSE)
    * Pandas compatibility module pandas.compat
    * six.py by Benjamin Peterson
    * Django
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    A decorator that defines __unicode__ and __str__ methods under Python
    2. Under Python 3, this decorator is a no-op.

    To support Python 2 and 3 with a single code base, define a __str__
    method returning unicode text and apply this decorator to the class,
like
    this::

    >>> from future.utils import python_2_unicode_compatible

    >>> @python_2_unicode_compatible
    ... class MyClass(object):
    ...     def __str__(self):
    ...         return u'Unicode string: \u5b54\u5b50'

    >>> a = MyClass()

    Then, after this import:

    >>> from future.builtins import str

    the following is ``True`` on both Python 3 and 2::

    >>> str(a) ==
a.encode('utf-8').decode('utf-8')
    True

    and, on a Unicode-enabled terminal with the right fonts, these both
print the
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    >>> print(a)
    >>> print(str(a))

    The implementation comes from django.utils.encoding.
   
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    Function from jinja2/_compat.py. License: BSD.

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    Function for iterating over dictionary keys with the same set-like
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    Function for iterating over dictionary values with the same set-like
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    Returns the globals and locals of the calling frame.

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        Equivalent to:

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            def __iter__(self):
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