On Tue, 2007-10-23 at 17:02 +0000, beginner wrote: > Hi All, > > If I have a list comprehension: > > ab=["A","B"] > c = "ABC" > [1.0 if c=='A' else c='B' for c in ab]
"c='B'" is invalid syntax. Maybe you mean "c=='B'". That doesn't make much sense, but at least it's correct syntax. > print c > > >>"B" > > My test shows that if c is not defined before the list comprehension, > it will be created in the list comprehension; if it is defined before > the list comprehension, the value will be overwritten. In other words, > temp variables are not local to list comprehensions. > > My question is why is this and is there any way to make c local to > list comp? The only way to keep c from being overwritten currently is to avoid using a list comprehension. Generator expressions don't "leak" their iteration variable to the outside, so you can write this instead: list(1.0 if c=='A' else c=='B' for c in ab) HTH, -- Carsten Haese http://informixdb.sourceforge.net -- http://mail.python.org/mailman/listinfo/python-list
