strange unbound local error?

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

.

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