Matt Nordhoff wrote:
Alan G Isaac wrote:
Hans Larsen schrieb:
How could I "take" an elemment from a set or a frozenset
On 3/8/2009 2:06 PM Diez B. Roggisch apparently wrote:
You iterate over them. If you only want one value, use
iter(the_set).next()
I recall a claim that
for result in myset: break
is the most efficient way to get one result.
Is this right? (It seems nearly the same.)
Alan Isaac
Checking Python 2.5 on Linux, your solution is much faster, but seeing
as they both come in under a microsecond, it hardly matters.
It's unexpected...
>>> timeit.timeit('res=iter(myset).next()', 'myset=range(1000000)')
0.88944123999999647
>>> timeit.timeit('res=myset.next()', 'myset=range(1000000);
myset=iter(myset)')
0.49165520000002516
>>> timeit.timeit('for res in myset: break', 'myset=range(1000000)')
0.32933007999997699
I'd never expect that for-loop assignment is even faster than a
precreated iter object (the second test)... but I don't think this
for-looping variable leaking behavior is guaranteed, isn't it?
Note: the second one exhausts the iter object.
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