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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
* binary_type: str in Python 2, bytes in Python 3
* string_types: basestring in Python 2, str 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: 孔子'
>>> 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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