On 2016-03-06 12:38, Tim Chase wrote: > On 2016-03-06 19:29, Sven R. Kunze wrote: > > what's the reason that reversed(zip(...)) raises as a TypeError? > > I'm not sure why reversed() doesn't think that the thing returned by > zip() isn't a sequence.
Ah, a little more digging suggests that in 2.x, zip() returned a list which "has a __reversed__() method [and] supports the sequence protocol (the __len__() method and the __getitem__() method with integer arguments starting at 0)." In 3.x, zip() returns a generic iterator which neither has a __reversed__() method nor has __len__() and __getitem__() methods. So it looks like one needs to either results = reversed(list(zip(...))) or, more efficiently (doing it with one less duplication of the list) results = list(zip(...)) results.reverse() -tkc -- https://mail.python.org/mailman/listinfo/python-list
