On 2016-03-06 19:29, Sven R. Kunze wrote: > what's the reason that reversed(zip(...)) raises as a TypeError? > > Would allowing reversed to handle zip and related functions lead to > strange errors?
Peculiar, as this works in 2.x but falls over in 3.x: $ python Python 2.7.9 (default, Mar 1 2015, 12:57:24) [GCC 4.9.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> list(reversed(zip(range(10), range(20,100)))) [(9, 29), (8, 28), (7, 27), (6, 26), (5, 25), (4, 24), (3, 23), (2, 22), (1, 21), (0, 20)] $ python3 Python 3.4.2 (default, Oct 8 2014, 10:45:20) [GCC 4.9.1] on linux Type "help", "copyright", "credits" or "license" for more information. >>> list(reversed(zip(range(10), range(20,100)))) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: argument to reversed() must be a sequence I'm not sure why reversed() doesn't think that the thing returned by zip() isn't a sequence. -tkc -- https://mail.python.org/mailman/listinfo/python-list
