Greg Ewing <greg.ewing <at> canterbury.ac.nz> writes:
>
> Raymond Hettinger wrote:
> > I propose that in Py3.0, the "and" and "or" operators be simplified to
> > always return a Boolean value instead of returning the last evaluated
> > argument.
>
> But then I would no longer be able to write
>
> foo = something or default_value
>
> which is one of my favourite Pythonisms!
Same here. I use this frequently. In fact, I sometimes use it in preference
to a default param in {}.get():
foo = somedict.get("blarg") or expensive_default()
That way the expensive default isn't calculated unless you need it. (Of
course, the dict has to only store values that evaluate to non-False, which
might not be possible in all situations.)
Skip
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