[Python-ideas] set.add() return value
janssen at parc.com
Tue Feb 17 19:02:20 CET 2009
Guido van Rossum <guido at python.org> wrote:
> This example also has a bug, which neither of the two posters
> responding caught (unless Bill J was being *very* subtle).
Sorry, I should have been more brutal. To my mind, the fact that Steve
got it wrong was a nice illustration of how much extra mental effort
needed to be expended because the feature Ralf suggests wasn't
available. You have to write a test, the test has to include an
inversion, you have to introduce a new variable to hold the result of
the test. That's something like 3 function points, instead of one.
Functionality "built in" into the standard library is much better for
everyone than functionality a programmer has to generate himself, mainly
because of the extra review it gets. I think that's the real payoff for
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