On Friday, April 4, 2014 5:51:11 PM UTC-4, Cliff Kachinske wrote:
>
> If I write a python module like this:
>
> # born_to_fail.py
> foo = 'bar'
> def main():
> print foo
> if __name__=='__main__': main()
>
>
The above shouldn't produce an error, but the following will:
foo = 'bar'
def main():
print foo
foo = 'foo'
In the above, the assignment to foo indicates foo is a local variable
(since it hasn't been explicitly declared as global), so the previous print
statement raises an exception because it refers to a local variable that
has not yet been declared.
In your original example, because there is no assignment to foo within the
function, the foo in the print statement is assumed to be global, and there
is no exception because foo is in fact a global variable.
Anthony
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