Is there a more elegant way to spell this?
steve+comp.lang.python at pearwood.info
Wed Jan 28 01:55:58 CET 2015
Neal Becker wrote:
> Is there a more elegant way to spell this?
> for x in [_ for _ in seq if some_predicate]:
Don't use _ as the loop variable here.
There are three common conventions for _ and this is none of them:
(1) n the interactive interpreter _ is used for the result of the last
py> _ * 2
(2) In locale-aware applications, _ is apparently used as a function for
localising text into the user's native language.
(3) _ is also commonly used as a "don't care" variable name:
a, _, b, _ = get_four_items() # but I only care about two of them
So in a loop, you would only use _ as the loop variable when you don't use
the loop variable, e.g.:
[random.random() for _ in range(10)]
Of course, a convention is just a convention, not a law, you can ignore such
conventions if you insist. But conventions make it easier and quicker to
understand code, not just for others, but for yourself as well.
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