R. David Murray added the comment: In 3.x a list comprehension (like a generator expression in 2.x) *is* a separate block:
>>> [x for x in range(3)] [0, 1, 2] >>> x Traceback (most recent call last): File "<stdin>", line 1, in <module> NameError: name 'x' is not defined I note that this is not in fact mentioned in the python3 version of the tutorial; there it still implies that it is completely equivalent to the unrolled if statement, which would imply it *was* in the same scope. IMO the 2.7 tutorial is complete in the sense that the "is equivalent to" example is clearly in the same scope, while the python3 tutorial is missing a note that the comprehension is its own scope. Given the fact that it is *different* between the two, I wonder if it would be appropriate to add a note (footnote?) to that effect to the 2.7 tutorial. There is such a footnote in the corresponding part of the language reference. ---------- nosy: +r.david.murray versions: +Python 3.4, Python 3.5 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue21739> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
