On 22 November 2017 at 17:50, Paul Moore <[email protected]> wrote:
> On 22 November 2017 at 16:38, Ivan Levkivskyi <[email protected]> > wrote: > > On 22 November 2017 at 17:16, Paul Moore <[email protected]> wrote: > >> > >> Docs more importantly than PEP IMO. And are you implying that there's > >> a difference between generator expressions and comprehensions? I > >> thought both were intended to behave as if expanded to a function > >> containing nested for loops? Nothing said in this thread so far (about > >> semantics, as opposed to about current behaviour) implies there's a > >> deliberate difference. > > > > > > I think there may be a difference: > > > > comprehension `g = [(yield i) for i in range(3)]` is defined as this > code: > > > > __result = [] > > __i = None > > try: > > for __i in range(3): > > __result.append(yield __i) > > g = __result > > finally: > > del __result, __i > > Not in the docs, it isn't... Yes, since there is almost nothing there, this is what I _propose_ (or actually Serhiy proposed it first) > The docs explicitly state that a new > scope is involved. > But docs don't say it is a _function_ scope. The meaning of that statement (as I understand it) is just that the loop variable doen't leak from comprehension. -- Ivan
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