如果两列之间存在反向,则Pandas会删除重复项

我有一个包含2列的数据集,如下所示……

InteractorA InteractorB
AGAP028204  AGAP005846
AGAP028204  AGAP003428
AGAP028200  AGAP011124
AGAP028200  AGAP004335
AGAP028200  AGAP011356
AGAP028194  AGAP008414

我正在使用Pandas,我想要删除两次出现的行,但是就像下面这样……

InteractorA InteractorB
AGAP002741  AGAP008026
AGAP008026  AGAP002741

对此……

InteractorA InteractorB
AGAP002741  AGAP008026

因为它们对于所有意图和目的都是一样的.

是否有内置的方法来处理这个？

解决方法:

我最终创建了一个hacky脚本,它遍历行和必要的数据片段,并检查是否出现连接或是否出现反向,并根据需要删除行索引.

import pandas as pd

checklist = []
indexes_to_drop = []

interactions = pd.read_csv('original_interactions.txt', delimiter = '\t')

for index, row in interactions.iterrows():
    check_string = row['InteractorA'] + row['InteractorB']
    check_string_rev = row['InteractorB'] + row['InteractorA']
    if (check_string or check_string_rev) in checklist:
        indexes_to_drop.append(index)
    else:
        pass
    checklist.append(check_string)
    checklist.append(check_string_rev)

no_dups = interactions.drop(interactions.index[indexes_to_drop])

print no_dups.shape

no_dups.to_csv('no_duplicates.txt',sep='\t',index = False)

2017年编辑：几年后,有了更多的经验,对于寻找类似东西的人来说,这是一个更优雅的解决方案：

In [8]: df
Out[8]:
  InteractorA InteractorB
0  AGAP028204  AGAP005846
1  AGAP028204  AGAP003428
2  AGAP028200  AGAP011124
3  AGAP028200  AGAP004335
4  AGAP028200  AGAP011356
5  AGAP028194  AGAP008414
6  AGAP002741  AGAP008026
7  AGAP008026  AGAP002741

In [18]: df['check_string'] = df.apply(lambda row: ''.join(sorted([row['InteractorA'], row['InteractorB']])), axis=1)

In [19]: df
Out[19]:
  InteractorA InteractorB          check_string
0  AGAP028204  AGAP005846  AGAP005846AGAP028204
1  AGAP028204  AGAP003428  AGAP003428AGAP028204
2  AGAP028200  AGAP011124  AGAP011124AGAP028200
3  AGAP028200  AGAP004335  AGAP004335AGAP028200
4  AGAP028200  AGAP011356  AGAP011356AGAP028200
5  AGAP028194  AGAP008414  AGAP008414AGAP028194
6  AGAP002741  AGAP008026  AGAP002741AGAP008026
7  AGAP008026  AGAP002741  AGAP002741AGAP008026

In [20]: df.drop_duplicates('check_string')
Out[20]:
  InteractorA InteractorB          check_string
0  AGAP028204  AGAP005846  AGAP005846AGAP028204
1  AGAP028204  AGAP003428  AGAP003428AGAP028204
2  AGAP028200  AGAP011124  AGAP011124AGAP028200
3  AGAP028200  AGAP004335  AGAP004335AGAP028200
4  AGAP028200  AGAP011356  AGAP011356AGAP028200
5  AGAP028194  AGAP008414  AGAP008414AGAP028194
6  AGAP002741  AGAP008026  AGAP002741AGAP008026