Pandas python .describe() formatting/output

Question

I am trying to get the .describe() function to output in a reformatted way. Here is the csv data (testProp.csv)

'name','prop'
A,1
A,2
B,  4
A,  3
B,  5
B,  2

when I type in the following:

from pandas import *

data = read_csv('testProp.csv')

temp = data.groupby('name')['prop'].describe()
temp.to_csv('out.csv')

the output is:

name       
A     count    3.000000
      mean     2.000000
      std      1.000000
      min      1.000000
      25%      1.500000
      50%      2.000000
      75%      2.500000
      max      3.000000
B     count    3.000000
      mean     3.666667
      std      1.527525
      min      2.000000
      25%      3.000000
      50%      4.000000
      75%      4.500000
      max      5.000000
dtype: float64

However, I want the data in the format below. I have tried transpose() and would like to maintain using the describe() and manipulate that instead of a .agg([np.mean(), np.max(), etc.... ):

    count   mean    std min 25% 50% 75% max
A   3   2   1   1   1.5 2   2.5 3
B    3  3.666666667 1.527525232 2   3   4   4.5 5

Rola · Accepted Answer · 2020-06-13 14:25:41Z

6

You can achieve that by running below code :

from pandas import *
data = read_csv('testProp.csv')
data.describe().T

answered Jun 13, 2020 at 14:25

Rola

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Comments

Anand S Kumar · Accepted Answer · 2015-09-29 04:23:34Z

One way to do this would be to first do .reset_index() , to reset the index for your temp DataFrame, and then use DataFrame.pivot as you want . Example -

In [24]: df = pd.read_csv(io.StringIO("""name,prop
   ....: A,1
   ....: A,2
   ....: B,  4
   ....: A,  3
   ....: B,  5
   ....: B,  2"""))

In [25]: temp = df.groupby('name')['prop'].describe().reset_index()

In [26]: newdf = temp.pivot(index='name',columns='level_1',values=0)

In [27]: newdf.columns.name = ''   #This is needed so that the name of the columns is not `'level_1'` .

In [28]: newdf
Out[28]:
      25%  50%  75%  count  max      mean  min       std
name
A     1.5    2  2.5      3    3  2.000000    1  1.000000
B     3.0    4  4.5      3    5  3.666667    2  1.527525

Then you can save this newdf to csv.

Vitalis · Accepted Answer · 2018-03-08 13:01:10Z

1

In pandas v0.22, you can use the unstack feature. Building on from @Kumar answer above, you can use the pandas stack/unstack feature and play around with it's variation.

from io import StringIO
import pandas as pd
df = pd.read_csv(StringIO("""name,prop
   A,1
   A,2
   B,  4
   A,  3
   B,  5
   B,  2"""))

df.shape
df
temp = df.groupby(['name'])['prop'].describe()
temp
temp.stack() #unstack(),unstack(level=-1) level can be -1, 0

Check out the documentation pandas unstack for more details

answered Mar 8, 2018 at 13:01

Vitalis

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