On Fri, Feb 23, 2018 at 12:35 PM Kyle Lahnakoski <klahnako...@mozilla.com> wrote:
> I believe list comprehensions are difficult to read because they are not > formatted properly. For me, list comprehension clauses are an > expression, followed by clauses executed in the order. Any list > comprehension with more than one clause should be one-line-per clause. > > Examples inline: > > On 2018-02-15 19:57, Steven D'Aprano wrote: > > Where should the assignment go? [(y, y**2) let y = x+1 for x in (1, 2, > > 3, 4)] [(y, y**2) for x in (1, 2, 3, 4) let y = x+1] > > Since y is a function of x, it must follow the for clause: > > > [ > > (y, y ** 2) > > for x in (1, 2, 3, 4) > > let y = x + 1 > > ] > > > How do they interact when you have multiple loops and if-clauses? [(w, > > w**2) for x in (1, 2, 3, 4) let y = x+1 for a in range(y) let z = a+1 > > if z > 2 for b in range(z) let w = z+1] > > They are applied in order: > > > [ > > (w, w**2) > > for x in (1, 2, 3, 4) > > let y = x+1 > > for a in range(y) > > let z = a+1 > > if z > 2 > > for b in range(z) > > let w = z+1 > > ] > > which is a short form for: > > > def stuff(): > > for x in (1, 2, 3, 4): > > y = x+1 > > for a in range(y): > > z = a+1 > > if z > 2: > > for b in range(z): > > w = z+1 > > yield (w, w**2) > > > > list(stuff()) > Is it that much shorter that it's worth giving up the benefit of indentation? > > > _______________________________________________ > Python-ideas mailing list > Python-ideas@python.org > https://mail.python.org/mailman/listinfo/python-ideas > Code of Conduct: http://python.org/psf/codeofconduct/ > > -- > > --- > You received this message because you are subscribed to a topic in the > Google Groups "python-ideas" group. > To unsubscribe from this topic, visit > https://groups.google.com/d/topic/python-ideas/KwZtO4rpAGE/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > python-ideas+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. >
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