Python iterable map, range, etc

Why doesn't python have a __future__ library that replaces map with im开发者_JAVA百科ap, range with xrange, etc.? Is it possible to write one?

There is future_builtins module since Python 2.6:

from future_builtins import filter, map, zip

A __future__ import is not necessary:

from itertools import imap as map
range = xrange

Edit: If you want to do several of those in a single line, you can do

from itertools import imap as map, ifilter as filter, izip as zip
range = xrange; input = raw_input

If you want to do this, why not add the following to your PYTHONSTARTUP file?

import itertools
filter = itertools.ifilter
map    = itertools.imap
slice  = itertools.islice
zip    = itertools.izip
range  = xrange
input  = raw_input