[Python-Dev] assignment expressions: an alternative proposal (original) (raw)

Chris Angelico rosuav at gmail.com
Tue Apr 24 12:07:24 EDT 2018

On Wed, Apr 25, 2018 at 1:56 AM, Yury Selivanov <yselivanov.ml at gmail.com> wrote:

On Tue, Apr 24, 2018 at 11:51 AM, Ethan Furman <ethan at stoneleaf.us> wrote:

When I compare to variables from outer scopes they usually are on the right side of '=='.

You mean something like if 2 == x: ? I never write code like that, and I haven't seen it, either. Hm. I mean this: const = 'something' def foo(arg): if arg == const: do something Note that "const" is on the right side of "==". Would you write this as def foo(arg): if const == arg: ? ;)

That's assuming the global is a constant. What if it's a mode-setting marker?

def foo(arg): ... if output == "verbose" or (output != "quiet" and error_count): print("Arg foo'd", arg) print("Errors found:", error_count)

Then I would definitely put the variable first. And I know a lot of people who would parenthesize the first condition in this.

ChrisA

More information about the Python-Dev mailing list