On Wed, May 30, 2018 at 1:52 PM Chris Angelico <[email protected]> wrote:
> On Thu, May 31, 2018 at 1:23 AM, Peter O'Connor > <[email protected]> wrote: > >> In comparison, I think that := is much simpler. > > > > > > In this case that's true, but a small modification: > > > > updates = { > > y: do_something_to(potential_update) > > for x in need_initialization_nodes > > for y in [x, *x.synthetic_inputs()] > > if potential_update is not None > > given potential_update = command.create_potential_update(y) > > } > > > > Shows the flexibility of this given syntax vs ":=" > > I don't understand what you're showcasing here. With :=, you give a > name to something at the exact point that it happens: > > updates = { > y: do_something_to(potential_update) > for x in need_initialization_nodes > for y in [x, *x.synthetic_inputs()] > if (potential_update := > command.create_potential_update(y)) is not None > } > > Personally, I'd use a shorter name for something that's used in such a > small scope (same as you use one-letter "x" and "y"). But that's the > only way that the 'given' syntax looks at all better - by encouraging > you to use yet another line, it conceals some of its immense > verbosity. (Note how the name "potential_update" is used twice with > :=, once to set and one to retrieve; but with given, it's used three > times - retrieve, retrieve, and set.) > > How does this show that 'given' is more flexible? > > Oh yeah, good point, I forgot that I could use := within the condition itself. It does show that this feature is useful, but not that given is more flexible than :=. > ChrisA > _______________________________________________ > Python-ideas mailing list > [email protected] > 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/keaR3FudcwQ/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > [email protected]. > For more options, visit https://groups.google.com/d/optout. >
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