Re: strange unbound local error?

On Sep 29, 8:04 pm, rig...@xxxxxxxx wrote:
hi folks,

suppose this snipplet:

spam = 42

def eggs():
print spam
spam = spam + 1

if __name__=="__main__":
eggs()

This thows an UnboundLocalError at line 4 (print statement). But if I
comment out line 5 (variable assignment), no error occurs.

Can you explain me this, please?

Regards,
Enrico

If you're going to assign to a global variable in a function, you need
to declare it as such:

spam = 42

def eggs():
global spam
print spam
spam = spam + 1

When Python sees an assignment to an identifier in a function it
creates a variable that is local to the function (otherwise you'd be
unable to create local variables with the same name as any of the
global variables).

-- bjorn



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