小编Hru*_*shi的帖子

如何使用索引添加新功能，例如数据帧长度和删除行值。我想添加一个新列，我可以在其中计算数据框中可用的行数，并使用索引删除行值。

for i in range(len(df)):
    if (df['col1'][i] == df['col2'][i]) and (df['col4'][i] == df['col3'][i]):
        pass
    elif (df['col1'][i] == df['col3'][i]) and (df['col4'][i] == df['col2'][i]): 
        df['col1'][i] = df['col2'][i]
        df['col4'][i] = df['col3'][i]
    else:
       df = df.drop(i)