python for with double test

[borges2003xx]

hi all
the is a way for doing a for with double test:
example
for i in range(0,10) and f==1:
........


thanx everyone

 

[Szabolcs Nagy]

for i in range(0,10):
if f!=1: break
...

i=0
while i<10 and f==1:
...
i+=1

 

[Peter Hansen]

hi all
the is a way for doing a for with double test:
example
for i in range(0,10) and f==1:
........

Not sure if you're asking a question, but is this what you are trying to
do? :

if f == 1:
for i in range(0,10):
...

If not, please explain more carefully what you want, maybe with an
example showing more than "..." in the body so we'll understand better.

-Peter

 

[Alan Franzoni]

Il 30 Dec 2005 09:02:30 -0800, (e-mail address removed) 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
(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.

--
Alan Franzoni <[email protected]>
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