UnboundLocalError: local variable 'sum1' referenced before assignment
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sum1=0def ni():sum1=sum1+2return sum1for i in iter(ni,8):print i
出现UnboundLocalError: local variable 'sum1' referenced before assignment
改正：
sum1=0def ni():global sum1#定义为全局变量sum1=sum1+2return sum1for i in iter(ni,8):print i
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