"Paul Rubin" <no.email@nospam.invalid> wrote in message
news:87fv95fom0....@jester.gateway.sonic.net...
> "Frank Millman" <fr...@chagford.com> writes:
>> I like dict comprehensions, but I don't use them very often, so when I do
>> I
>> need to look up the format.
>
> I never felt a need for them. Do they generate better code than
>
> d = dict((k,v) for k,v in [('name','paul'),('language','python')]) ?
>
I ran timeit, and dict comps are quite a bit quicker. This is with Python
3.4.1 -
C:\>python -m timeit -s "x=range(65, 91); y=(chr(z) for z in x)" "dict((a,
b) for a, b in zip(x, y))"
100000 loops, best of 3: 16.1 usec per loop
C:\>python -m timeit -s "x=range(65, 91); y=(chr(z) for z in x)" "{a: b for
a, b in zip(x, y)}"
100000 loops, best of 3: 6.38 usec per loop
Frank
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