> Sent: Thursday, September 07, 2017 at 6:43 AM > From: "Denis Krienbühl" <de...@href.ch> > To: python-ideas@python.org > Subject: [Python-ideas] if <expression> as <variable> > > Hi! > > I’ve been having this idea for a few years and I thought I finally see if > what others think of it. I have no experience in language design and I don’t > know if this is something I’ve picked up in some other language. I also do > not know what the ramifications of implementing this idea would be. I just > keep thinking about it :) > > I quite often write code like the following in python: > > result = computation() > if result: > do_something_with_computation(result) > > More often than not this snippet evolves from something like this: > > if computation(): > … > > That is, I use the truthiness of the value at first. As the code grows I > refactor to actually do something with the result. > > What I would love to see is the following syntax instead, which to me is much > cleaner: > > if computation() as result: > do_something_with_result(result) > > Basically the result variable would be the result of the if condition’s > expression and it would be available the same way it would be if we used my > initial snippet (much the same way that the result of with expressions also > stays around outside the with-block). > > Any feedback is appreciated :)
I also often wonder why we are left doing an assignment and test. You have two options: 1. assign to a variable then test and use 2. repeat the function call I would offer that 'with' [sh|c]ould be used: with test() as x: handle_truthy(x) else: handle_falsey() # do we provide x here too? Because None vs False? _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
