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"""
A module that brings in equivalents of various modified Python 3 builtins
into Py2. Has no effect on Py3.
The builtin functions are:
- ``ascii`` (from Py2's future_builtins module)
- ``hex`` (from Py2's future_builtins module)
- ``oct`` (from Py2's future_builtins module)
- ``chr`` (equivalent to ``unichr`` on Py2)
- ``input`` (equivalent to ``raw_input`` on Py2)
- ``next`` (calls ``__next__`` if it exists, else ``next`` method)
- ``open`` (equivalent to io.open on Py2)
- ``super`` (backport of Py3's magic zero-argument super() function
- ``round`` (new "Banker's Rounding" behaviour from Py3)
``isinstance`` is also currently exported for backwards compatibility
with v0.8.2, although this has been deprecated since v0.9.
input()
-------
Like the new ``input()`` function from Python 3 (without eval()), except
that it returns bytes. Equivalent to Python 2's ``raw_input()``.
Warning: By default, importing this module *removes* the old Python 2
input() function entirely from ``__builtin__`` for safety. This is
because forgetting to import the new ``input`` from ``future`` might
otherwise lead to a security vulnerability (shell injection) on Python 2.
To restore it, you can retrieve it yourself from
``__builtin__._old_input``.
Fortunately, ``input()`` seems to be seldom used in the wild in Python
2...
"""
from future import utils
if utils.PY2:
from io import open
from future_builtins import ascii, oct, hex
from __builtin__ import unichr as chr, pow as _builtin_pow
import __builtin__
# Only for backward compatibility with future v0.8.2:
isinstance = __builtin__.isinstance
# Warning: Python 2's input() is unsafe and MUST not be able to be used
# accidentally by someone who expects Python 3 semantics but forgets
# to import it on Python 2. Versions of ``future`` prior to 0.11
# deleted it from __builtin__. Now we keep in __builtin__ but shadow
# the name like all others. Just be sure to import ``input``.
input = raw_input
from future.builtins.newnext import newnext as next
from future.builtins.newround import newround as round
from future.builtins.newsuper import newsuper as super
from future.types.newint import newint
_SENTINEL = object()
def pow(x, y, z=_SENTINEL):
"""
pow(x, y[, z]) -> number
With two arguments, equivalent to x**y. With three arguments,
equivalent to (x**y) % z, but may be more efficient (e.g. for ints).
"""
# Handle newints
if isinstance(x, newint):
x = long(x)
if isinstance(y, newint):
y = long(y)
if isinstance(z, newint):
z = long(z)
try:
if z == _SENTINEL:
return _builtin_pow(x, y)
else:
return _builtin_pow(x, y, z)
except ValueError:
if z == _SENTINEL:
return _builtin_pow(x+0j, y)
else:
return _builtin_pow(x+0j, y, z)
# ``future`` doesn't support Py3.0/3.1. If we ever did, we'd add this:
# callable = __builtin__.callable
__all__ = ['ascii', 'chr', 'hex', 'input', 'isinstance', 'next', 'oct',
'open', 'pow', 'round', 'super']
else:
import builtins
ascii = builtins.ascii
chr = builtins.chr
hex = builtins.hex
input = builtins.input
next = builtins.next
# Only for backward compatibility with future v0.8.2:
isinstance = builtins.isinstance
oct = builtins.oct
open = builtins.open
pow = builtins.pow
round = builtins.round
super = builtins.super
__all__ = []
# The callable() function was removed from Py3.0 and 3.1 and
# reintroduced into Py3.2+. ``future`` doesn't support Py3.0/3.1. If we ever
# did, we'd add this:
# try:
# callable = builtins.callable
# except AttributeError:
# # Definition from Pandas
# def callable(obj):
# return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
# __all__.append('callable')
|
