python提示AttributeError: 'NoneType' object has no attribute 'append'
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在写python脚本时遇到AttributeError: 'NoneType' object has no attribute 'append'
a=[]
b=[1,2,3,4]
a = a.append(b)
执行一次后发现a的类型变为了NoneType。
下次执行时就会出现如题所示的错误。
把a = a.append(b)改为a.append(b)后问题解决。原因:append会修改a本身,并且返回None。不能把返回值再赋值给a。
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