Python:根据 Pandas 数据框中的两列(变量)获取频率计数，某些行应用程序 [英] Python: get a frequency count based on two columns (variables) in pandas dataframe some row appers

问题描述

您好，我有以下数据框.

Hello I have the following dataframe.

    Group           Size

    Short          Small
    Short          Small
    Moderate       Medium
    Moderate       Small
    Tall           Large

我想计算同一行在数据框中出现的频率.

I want to count the frequency of how many time the same row appears in the dataframe.

    Group           Size      Time

    Short          Small        2
    Moderate       Medium       1 
    Moderate       Small        1
    Tall           Large        1

推荐答案

您可以使用 groupby 的 size:

You can use groupby's size:

In [11]: df.groupby(["Group", "Size"]).size()
Out[11]:
Group     Size
Moderate  Medium    1
          Small     1
Short     Small     2
Tall      Large     1
dtype: int64

In [12]: df.groupby(["Group", "Size"]).size().reset_index(name="Time")
Out[12]:
      Group    Size  Time
0  Moderate  Medium     1
1  Moderate   Small     1
2     Short   Small     2
3      Tall   Large     1

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