New in version 2.6.
This module provides functions that exist in 2.x, but have different behavior in Python 3, so they cannot be put into the 2.x builtins namespace.
Instead, if you want to write code compatible with Python 3 builtins, import them from this module, like this:
from future_builtins import map, filter ... code using Python 3-style map and filter ...
The 2to3 tool that ports Python 2 code to Python 3 will recognize this usage and leave the new builtins alone.
The Python 3
print() function is already in the builtins, but cannot be
accessed from Python 2 code unless you use the appropriate future statement:
from __future__ import print_function
Available builtins are:
Returns the same as
repr(). In Python 3,
repr()will return printable Unicode characters unescaped, while
ascii()will always backslash-escape them. Using
repr()in 2.6 code makes it clear that you need a pure ASCII return value.
map(function, iterable, ...)¶
In Python 3,
map()does not accept
Nonefor the function argument.