Il 30 Dec 2005 09:02:30 -0800, [EMAIL PROTECTED] ha scritto:
> hi all
> the is a way for doing a for with double test:
what's a 'double test' exactly? :-)
'for' does no test, it just iterates over a list. If you want to execute
the iteration only if f is 1, do this:
if f==1:
for i in range(0,10):
...
if you want to use only certain values in the range, when the value of f[i]
(f may be a list, a dictionary, or whatever) is 1, you can use a list
comprehension:
for i in [x for x in range(0,10) if f[x]==1]:
....
of course, if you want to make it shorter, you can define a function
instead of the 'for' code block and use the list comprehension directly:
def myfunction(x):
...
[myfunction(x) for x in range(0,10) if f[x]==1]
and you'll end up with a list of the return values of myfunction.
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Alan Franzoni <[EMAIL PROTECTED]>
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