python referenced before assignment问题
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一、意思:
二、错误原因
三、产生这个错误的场景(2.7)
val=9def test(flag): if flag: val = 1 else: print 'fuck' return val test(0)
错误提示:UnboundLocalError: local variable 'val' referenced before assignment
解决方法:用global关键字来进行说明该变量是全局变量
val=9def test(flag): global val if flag: val = 1 else: print 'test' return valtest(0)
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