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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
i����Niiiiiiitpypy_translation_infocCs%ts!|j|_d�|_n|S(s�
    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
    Chinese characters for Confucius::

    >>> print(a)
    >>> print(str(a))

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

    Use it like this::

        class BaseForm(object):
            pass

        class FormType(type):
            pass

        class Form(with_metaclass(FormType, BaseForm)):
            pass

    This requires a bit of explanation: the basic idea is to make a
    dummy metaclass for one level of class instantiation that replaces
    itself with the actual metaclass.  Because of internal type checks
    we also need to make sure that we downgrade the custom metaclass
    for one level to something closer to type (that's why __call__ and
    __init__ comes back from type etc.).

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cCs-t|t�r|jd�Sdj|�SdS(Nslatin-1t(RtunicodeRtjoin(R((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyR!�s
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    Encodes to latin-1 (where the first 256 chars are the same as
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    sutf-8cCs
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|j|�S(N(tdecode(tbR%((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytbytes_to_native_str�scCs|S(N((ttR%((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyttext_to_native_str�scCsddlm}||�S(Ni����(tnewbytes(tfuture.typesR,(RR%R,((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyR&�scCs
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        Use this to create a Py2 native string when "from __future__ import
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    On Py3, returns an encoded string.
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    cOstt||��S(N(tlisttrange(targstkwargs((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytlrange�scOstt||��S(N(R0tzip(R2R3((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytlzip�scOstt||��S(N(R0tmap(R2R3((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytlmap�scOstt||��S(N(R0tfilter(R2R3((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytlfilter�scCse|r#td�|jd�D��Str3|j�Sddl}|jd�}t|j|��SdS(sE
    A function equivalent to the str.isidentifier method on Py3
    css|]}t|�VqdS(N(tisidentifier(t.0ta((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pys	<genexpr>st.i����Ns[a-zA-Z_][a-zA-Z0-9_]*$(talltsplitRR;tretcompiletbooltmatch(RtdottedRAt_name_re((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyR;�s
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    Function for iterating over dictionary items with the same set-like
    behaviour on Py2.7 as on Py3.

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    Function for iterating over dictionary keys with the same set-like
    behaviour on Py2.7 as on Py3.

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    Function for iterating over dictionary values with the same set-like
    behaviour on Py2.7 as on Py3.

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viewvaluesN(RHR
tvalues(RJR3RK((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyRN%scKs.t|dd�}|s$|j}n||�S(ssUse this only if compatibility with Python versions before 2.7 is
    required. Otherwise, prefer viewitems().
    t	iteritemsN(RHR
RI(RJR3RK((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyRP1scKs.t|dd�}|s$|j}n||�S(srUse this only if compatibility with Python versions before 2.7 is
    required. Otherwise, prefer viewkeys().
    titerkeysN(RHR
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RO(RJR3RK((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyRREscCs<ts(t||tj|d|��nt|||�dS(s/Bind a method to class, python 2 and python 3 compatible.

    Parameters
    ----------

    cls : type
        class to receive bound method
    name : basestring
        name of method on class instance
    func : function
        function to be bound as method

    Returns
    -------
    None
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    Returns the globals and locals of the calling frame.

    Is there an alternative to frame hacking here?
    ii(tinspecttstackt	f_globalstf_locals(tcaller_framet	myglobalstmylocals((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyt_get_caller_globals_and_localsks

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    Returns the string without any initial or final quotes.
    t'ii����N(treprt
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        Equivalent to:

            raise EXCEPTION from CAUSE

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        A function that matches the Python 2.x ``raise`` statement. This
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        Equivalent to:

            raise EXCEPTION from CAUSE

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        iRts/exception causes must derive from BaseExceptioniN(RRRrt	ExceptiontFalset__suppress_context__t	__cause__RWRXRttTrueR
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def raise_(tp, value=None, tb=None):
    raise tp, value, tb

def raise_with_traceback(exc, traceback=Ellipsis):
    if traceback == Ellipsis:
        _, _, traceback = sys.exc_info()
    raise exc, None, traceback
sjRaise exception with existing traceback.
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    From jinja2/_compat.py. License: BSD.

    Use as a decorator like this::

        @implements_iterator
        class UppercasingIterator(object):
            def __init__(self, iterable):
                self._iter = iter(iterable)
            def __iter__(self):
                return self
            def __next__(self):
                return next(self._iter).upper()

    N(Rt__next__tnext(R((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytimplements_iterator�s
cCs|jS(N(R�(tx((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyRscCs|jS(N(R�(R�((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pyRscCs.tr
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    Python 2.7 has both new-style and old-style classes. Old-style classes can
    be pesky in some circumstances, such as when using inheritance.  Use this
    function to test for whether a class is new-style. (Python 3 only has
    new-style classes.)
    t	__class__t__dict__t	__slots__(thasattrtdir(R((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytis_new_style s!cCst|td��S(s
    Deprecated. Use::
        >>> isinstance(obj, str)
    after this import:
        >>> from future.builtins import str
    u(RR(RJ((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytistext0scCst|td��S(s�
    Deprecated. Use::
        >>> isinstance(obj, bytes)
    after this import:
        >>> from future.builtins import bytes
    R"(RR(RJ((s9/usr/lib/python2.7/site-packages/future/utils/__init__.pytisbytes:scCst|�jdkS(s
    Equivalent to the result of ``type(obj)  == type(newbytes)``
    in other words, it is REALLY a newbytes instance, not a Py2 native str
    object?

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    equivalent to ininstance(obj, newbytes)
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    ``long``.

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        >>> isinstance(obj, int)

    The following idiom is equivalent:

        >>> from numbers import Integral
        >>> isinstance(obj, Integral)
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    On Py3, this is a no-op: native(obj) -> obj

    On Py2, returns the corresponding native Py2 types that are
    superclasses for backported objects from Py3:

    >>> from builtins import str, bytes, int

    >>> native(str(u'ABC'))
    u'ABC'
    >>> type(native(str(u'ABC')))
    unicode

    >>> native(bytes(b'ABC'))
    b'ABC'
    >>> type(native(bytes(b'ABC')))
    bytes

    >>> native(int(10**20))
    100000000000000000000L
    >>> type(native(int(10**20)))
    long

    Existing native types on Py2 will be returned unchanged:

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    DEPRECATED: import ``old_div`` from ``past.utils`` instead.

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        class MyClass(object):
            @as_native_str(encoding='ascii')
            def __repr__(self):
                return next(self._iter).upper()
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