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daibuchong
参考：http://blog.csdn.net/my2010sam/article/details/17735159
http://blog.csdn.net/onlyanyz/article/details/45009697
http://blog.csdn.net/magictong/article/details/4464024
全局变量报错：UnboundLocalError: local variable 'xxxxx' referenced before assignment
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原文地址：http://www.cnblogs.com/hellojesson/p/5845153.html
