Tommytrojan wrote: > Duncan, > > thanks for your quick reply. I guess I should have included the output. > I thought I was clear in the error description. > The problem is that I never assign to 'string'. I only reference it (as > the error message correctly states). If you comment out the import > statement in the except clause the program runs fine. Now notice that > the exception hander never gets executed! Any explanation? > You have an assignment to 'string' in the function (import, class and def statements are all equivalent to assignment statements so far as scoping is concerned). It doesn't matter whether or not the assignment gets executed: the compiler flags the variable as a local variable.
See the Python FAQ, 1.2.2: 1.2.2 What are the rules for local and global variables in Python? In Python, variables that are only referenced inside a function are implicitly global. If a variable is assigned a new value anywhere within the function's body, it's assumed to be a local. If a variable is ever assigned a new value inside the function, the variable is implicitly local, and you need to explicitly declare it as 'global'. -- http://mail.python.org/mailman/listinfo/python-list
