New submission from Gareth Rees:
In Python 2.7, future_builtins.map accepts None as its first (function)
argument:
Python 2.7.5 (default, Aug 1 2013, 01:01:17)
>>> from future_builtins import map
>>> list(map(None, range(3), 'ABC'))
[(0, 'A'), (1, 'B'), (2, 'C')]
But in Python 3.x, map does not accept None as its first argument:
Python 3.3.2 (default, May 21 2013, 11:50:47)
>>> list(map(None, range(3), 'ABC'))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable
The documentation says, "if you want to write code compatible with Python 3
builtins, import them from this module," so this incompatibility may give
Python 2.7 programmers the false impression that a program which uses map(None,
...) is portable to Python 3.
I suggest that future_builtins.map in Python 2.7 should behave the same as map
in Python 3: that is, it should raise a TypeError if None was passed as the
first argument.
----------
components: Library (Lib)
messages: 201020
nosy: Gareth.Rees
priority: normal
severity: normal
status: open
title: Python 2.7's future_builtins.map is not compatible with Python 3's map
type: behavior
versions: Python 2.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue19363>
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