# -*- coding: utf-8 -*-
"""
Created on Tue Dec  7 15:51:09 2021

@author: Sim
"""
import pandas as pd

df = pd.DataFrame({'group': [0, 0, 0, 2 ,2, 1, 1, 1, 1],
                   'values':[1, 2, 3, 4, 5, 6, 7, 8, 9]})
gmm = df.groupby(by='group').mean()
print(gmm.reset_index())
gvv = df.groupby(by='group').var(ddof=1)
print(gvv.reset_index())
gcc = df.groupby(by='group').count()
print(gcc.reset_index())