Hello,
today I wrote this piece of code and I am wondering why it does not work
the way I expect it to work. Here's the code:
y = 0
def func():
y += 3
func()
This gives an
UnboundLocalError: local variable 'y' referenced before assignment
If I change the function like this:
y = 0
def func():
print y
func()
then no error is thrown and python apparently knows about 'y'.
I don't understand why the error is thrown in the first place. Can
somebody explain the rule which is causing the error to me?
-Matthias
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