ValueError: The name None occurs multiple times, use a level number

pandas 透视查询：

>>> pd.pivot_table(df,index='时间',values='VinNo',columns='运输gs',aggfunc={'sum'},fill_value=0,margins=True)

报错：
f"The name {level} occurs multiple times, use a level number"
ValueError: The name None occurs multiple times, use a level number

解决方法很简单：
>>> pd.pivot_table(df,index='时间',values='VinNo',columns='运输gs',aggfunc=sum,dropna=False,fill_value=0,margins=True)

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