[issue21964] inconsistency in list-generator comprehension with yield(-from)
hakril added the comment:
I found something else, I think it worth mentioning it.
This side-effect allows to create generators that return other values that
None. And the CPython's behavior is not the same for all versions:
{(yield i) : i for i in range(2)}
generator object dictcomp at 0x7f0b98f41410
list(_)
# python3.(3,4,5)
[0, 1]
# python3.2
[0, 1, {None: 1}] # python3.2 appends the generator's return value.
--
versions: +Python 3.2, Python 3.3
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[issue21964] inconsistency in list-generator comprehension with yield(-from)
New submission from hakril: Will playing with generators and `yield from` I found some inconsistency. list comprehension with yield(-from) would return a generator. generator comprehension would yield some None in the middle of the expected values. Examples: l = [abc, range(3)] g1 = [(yield from i) for i in l] print(g) generator object listcomp at 0x7f5ebd58b690 print(list(g)) ['a', 'b', 'c', 0, 1, 2] # this result is super cool ! g2 = ((yield from i) for i in l) print(g2) generator object genexpr at 0x7f5ebd58b6e0 print(list(g2)) ['a', 'b', 'c', None, 0, 1, 2, None] For `g1`: it returns a generator because the listcomp contains a `yield from`. For `g2` it append None because it yield the return value of `yield from i`. It could be rewritten as: def comp(x): for i in x: yield (yield from i) -- components: Interpreter Core messages: 222811 nosy: hakril priority: normal severity: normal status: open title: inconsistency in list-generator comprehension with yield(-from) type: behavior versions: Python 3.5 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21964 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21947] `Dis` module doesn't know how to disassemble generators
New submission from hakril: The `dis` module doesn't know how to disassemble generator object because it has no idea about the `gi_code` attribute. I made a (very) little patch to change this behavior. If there is a valid reason to not let the `dis` module disassemble generator, I would be glad to know it. -- components: Extension Modules files: dis_generator.patch keywords: patch messages: 222619 nosy: hakril priority: normal severity: normal status: open title: `Dis` module doesn't know how to disassemble generators type: enhancement versions: Python 3.5 Added file: http://bugs.python.org/file35914/dis_generator.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21947 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue21947] `Dis` module doesn't know how to disassemble generators
hakril added the comment: Here is a try for a better patch. Added a unit test and updated the doc. -- Added file: http://bugs.python.org/file35918/dis_generator2.patch ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue21947 ___ ___ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
