[Python-projects] PyLint: scope of variable of list comprehension

[Maarten ter Huurne]

python-projects-bounces at lists.logilab.org wrote on 2006-07-19 09:25:07 PM:

> > But if I run this code in Python, there is no variable named "n" in
> > the global scope. So it seems that in this respect, the "for" of a
> > list comprehension / generator expression is different than the "for"
> > statement.
> 
> This is only true for generator expressions.  With list comprehensions 
> the name is "leaking"::

You are right.

I first encountered the problem with a generator expression which created 
a dictionary. Then I made the test case with a list, since that required 
less code. Then I noticed list comprehension triggers the same warning, 
but I forgot to verify that "n" was undefined (and in fact, it is 
"leaking" and thus defined).

So please ignore the part about list comprehension, but the bug is valid 
for generator expressions.

(Does Debian have Python 2.4 as the default by now? ;)

Bye,
                Maarten
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