合并包含重复行的两个相同文件时，python输出中的行数将增加一倍

first.xlsx

name    rol no  pass
manoj   sad654  1254    asd 76325
anhi    as76    4954    243jh
abdul   ahsg786 984523  asjdf987
manoj   sad654  4954    243jh
abhi    as76    1254    asd 76325
manoj   sad654  1254    asd 76325
anhi    as76    4954    243jh
abdul   ahsg786 984523  asjdf987
manoj   sad654  4954    243jh
abhi    as76    1254    asd 76325

second.xlsx也包含相同的行

所以当我尝试合并这些first和secons xlsx时，它每行打印4次 这将是2次在大熊猫

import pandas as pd
first=pd.read_excel("C:/Users/mjb952/Desktop/first.xlsx")
second=pd.read_excel("C:/Users/mjb952/Desktop/second.xlsx")
comparison_df = pd.merge(first,second,indicator=True,how='outer')
print(comparison_df)

产量为

    name      rol      no       pass _merge
0   manoj   sad654    1254  asd 76325   both
1   manoj   sad654    1254  asd 76325   both
2   manoj   sad654    1254  asd 76325   both
3   manoj   sad654    1254  asd 76325   both
4    anhi     as76    4954      243jh   both
5    anhi     as76    4954      243jh   both
6    anhi     as76    4954      243jh   both
7    anhi     as76    4954      243jh   both
8   abdul  ahsg786  984523   asjdf987   both
9   abdul  ahsg786  984523   asjdf987   both
10  abdul  ahsg786  984523   asjdf987   both
11  abdul  ahsg786  984523   asjdf987   both
12  manoj   sad654    4954      243jh   both
13  manoj   sad654    4954      243jh   both
14  manoj   sad654    4954      243jh   both
15  manoj   sad654    4954      243jh   both
16   abhi     as76    1254  asd 76325   both
17   abhi     as76    1254  asd 76325   both
18   abhi     as76    1254  asd 76325   both
19   abhi     as76    1254  asd 76325   both

0警告20楠楠楠

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警告数量=20

如果您以相同的方式加入

first

和

first

会发生什么？

   name rol  no pass