如何通过pandas.apply进行整列和整行计算，以及如何处理A value is trying to be set on a copy of a slice from a DataFrame.错误

df[['星期日']].apply(lambda x:time_diff(x),axis = 0) #axis = 0 将每列数据传入,axis = 1将每行数据传入

#df[['星期日']].apply(time_diff,axis = 0) #axis = 0 将每列数据传入,axis = 1将每行数据传入#df.apply(time_diff,axis = 1) #axis = 0 将每列数据传入,axis = 1将每行数据传入

'''将内容增加到副本上面去前，需要将副本拷贝一下，否则会弹出A value is trying to be set on a copy of a slice from a DataFrame.'''df2 = df[['星期一']]print(df2)df3 = df2.copy()df3['时间差'] = pd.Series(data=time_diff_list,index=df3.index)