熊猫中有两列的变量

Question

我不确定我的变量 df['education'] 在打印出来时如何具有两个相同的列，而不仅仅是一个列。当我检查变量的类型时，它说它是一个系列，但是一个系列怎么会有两列呢？

 df2['education']

                education            education
0        Higher education     Higher education
1        Higher education     Higher education
2        Higher education     Higher education
3        Higher education     Higher education
4        Higher education     Higher education
5        Higher education     Higher education
6        Higher education     Higher education
7        Higher education     Higher education

[4743 rows x 2 columns]

如何合并两者或只保留一列？

Answer 1

存在重复列名的问题，所以如果选择获取DataFrame中的所有列。

如果使用read_csv，解决方案是为0.19.0+升级pandas，默认情况下会避免它，它会创建2列education和education.1。

另一种解决方案是使用cumcount 将计数添加到重复的列名称：

df = pd.DataFrame({'A':list('abc'),
                    'B':[4,5,4],
                    'C':[7,8,9]})
df.columns = ['id', 'education', 'education']
print (df)
  id  education  education
0  a          4          7
1  b          5          8
2  c          4          9

s = df.columns.to_series()
count = s.groupby(s).cumcount().astype(str)

df.columns = s.mask(count != '0', s + '.' + count)
print (df)
  id  education  education.1
0  a          4            7
1  b          5            8
2  c          4            9