Pandas row filters and and division from specific rows and columns

Question

I have the following dataframe:-

traffic_type    date        region   total_views
desktop         01/04/2018  aug      50
mobileweb       01/04/2018  aug             


        

Answer 1

One idea with pivoting:

df1 = df.pivot_table(index=['date','region'], 
                     columns='traffic_type', 
                     values='total_views', 
                     aggfunc='sum')
print (df1)
traffic_type       desktop  mobileweb  total
date       region                           
01/04/2018 aug          50         60    200
           world        20         30     40

df2 = df1['desktop'].div(df1['total']).reset_index(name='desktop_share').assign(traffic_type='total')

df = df.merge(df2, how='left')
print (df)
  traffic_type        date region  total_views  desktop_share
0      desktop  01/04/2018    aug           50            NaN
1    mobileweb  01/04/2018    aug           60            NaN
2        total  01/04/2018    aug          200           0.25
3      desktop  01/04/2018  world           20            NaN
4    mobileweb  01/04/2018  world           30            NaN
5        total  01/04/2018  world           40           0.50

Another idea with MultiIndex:

df1 = df.set_index(['traffic_type','date','region'])

a = df1.xs('desktop', drop_level=False).rename({'desktop':'total'})
b = df1.xs('total', drop_level=False)

df = df1.assign(desktop_share = a['total_views'].div(b['total_views'])).reset_index()
print (df)
  traffic_type        date region  total_views  desktop_share
0      desktop  01/04/2018    aug           50            NaN
1    mobileweb  01/04/2018    aug           60            NaN
2        total  01/04/2018    aug          200           0.25
3      desktop  01/04/2018  world           20            NaN
4    mobileweb  01/04/2018  world           30            NaN
5        total  01/04/2018  world           40           0.50