Paul Rubin wrote:
> "Kay Schluehr" <[EMAIL PROTECTED]> writes:
> > Hmm. A statement has side-effects but it returns no value. And yes, you
> > can create a name within an expression producing a value in Python,
> > using a list/generator comprehension. The solution to Bob's problem
> > would look like this:
> >
> > if (I for I in (a.find("3"),) ) != -1:
> > print "It's here: ", I
> > else:
> > print "No 3's here"
>
> I think that works for list comprehensions but not generator
> comprehensions. With generator comprehensions, the index variable's
> scope is limited to the comprehension.
Right. It becomes even more ugly yet:
if [I for I in ("1,2,3".find("3"),) ] != [-1]:
print "It's here: ", I
else:
print "No 3's here"
> With list comprehensions
> there's a wart in that the index variable is still around afterwards.
Definitely, but index variable survival is nothing that entered Python
with list-comps:
for k in range(2):
print k
>>> k
1
Kay
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