如何在Python中的groupby中计算计数和百分比 [英] How to calculate count and percentage in groupby in Python

问题描述

分组后，我得到以下输出

I have following output after grouping by

Publisher.groupby('Category')['Title'].count()
Category
Coding          5
Hacking         7
Java            1
JavaScript      5
LEGO           43
Linux           7
Networking      5
Others        123
Python          8
R               2
Ruby            4
Scripting       4 
Statistics      2
Web             3

在上面的输出中，我还希望百分比，即第一行5*100/219，依此类推.我正在关注

In the above output I want the percentage also i.e for the first row 5*100/219 and so on. I am doing following

 Publisher.groupby('Category')['Title'].agg({'Count':'count','Percentage':lambda x:x/x.sum()})

但这给我一个错误.请帮助

But it gives me an error. Please help

推荐答案

我认为您可以使用:

P = Publisher.groupby('Category')['Title'].count().reset_index()
P['Percentage'] = 100 * P['Title']  / P['Title'].sum()

示例:

Publisher = pd.DataFrame({'Category':['a','a','s'],
                   'Title':[4,5,6]})

print (Publisher)
  Category  Title
0        a      4
1        a      5
2        s      6

P = Publisher.groupby('Category')['Title'].count().reset_index()
P['Percentage'] = 100 * P['Title']  / P['Title'].sum()
print (P)
  Category  Title  Percentage
0        a      2   66.666667
1        s      1   33.333333

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