Encountered AttributeError: 'NoneType' object has no attribute 'append' when writing a python script
a=[]
b=[1,2,3,4]
a = a.append(b) '''会报错，改为a.append(b)'''
Reason: because there is no return value
python：python提示AttributeError: ‘NoneType‘ object has no attribute ‘append‘
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Origin blog.csdn.net/zhizhengguan/article/details/130127267
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