了解MultiIndex [英] understanding MultiIndex

问题描述

所以我在csv中有一个示例数据集:-

So I have a sample data set like this in csv:-

name    team    date       score
John    A   3/9/12      100
John    B   3/9/12      99
Jane    B   4/9/12      102
Peter   A   9/9/12      103
Josie   C   11/9/12     111
Rachel  A   30/10/12    98
Kate    B   31/10/12    103
David   C   1/11/12     104

执行以下操作:-

from pandas.io.parsers import read_csv

df = read_csv("data/Workbook1.csv", index_col=["team", "name"])

df

                 date  score
team name                   
A    John      3/9/12    100
B    John      3/9/12     99
     Jane      4/9/12    102
A    Peter     9/9/12    103
C    Josie    11/9/12    111
A    Rachel  30/10/12     98
B    Kate    31/10/12    103
C    David    1/11/12    104

如何进一步压缩第一个索引(团队")，以使我没有重复的值?成为:-

How do I compress the first index ("team") further so that I don't have duplicate values? To become:-

                 date  score
team name                   
A    John      3/9/12    100
     Peter     9/9/12    103
     Rachel  30/10/12     98
B    John      3/9/12     99
     Jane      4/9/12    102
     Kate    31/10/12    103
C    Josie    11/9/12    111
     David    1/11/12    104

推荐答案

自己弄清楚了.

df = read_csv("data/Workbook1.csv")

df

     name team      date  score
0    John    A    3/9/12    100
1    John    B    3/9/12     99
2    Jane    B    4/9/12    102
3   Peter    A    9/9/12    103
4   Josie    C   11/9/12    111
5  Rachel    A  30/10/12     98
6    Kate    B  31/10/12    103
7   David    C   1/11/12    104

df2 = df.pivot('team', 'name').stack()

df2

                 date  score
team name                   
A    John      3/9/12    100
     Peter     9/9/12    103
     Rachel  30/10/12     98
B    Jane      4/9/12    102
     John      3/9/12     99
     Kate    31/10/12    103
C    David    1/11/12    104
     Josie    11/9/12    111

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