Это должно работать.
import pandas as pd
df = pd.DataFrame({'ID':['Billy Elliot','next to normal','shrek','guys and dolls',
'west side story', 'pal joey'],
'Season' : [20082009,20082009,20082009,
20082009,20082009,20082009],
'AFRAM' : [2,0,4,4,0,1],
'ASIAM' : [0,0,1,0,0,0],
'CAU' : [48,10,25,24,28,20],
'LAT' : [1,0,1,3,18,0],
'OTH' : [0,0,0,0,0,0]})
print(df)
# AFRAM ASIAM CAU ID LAT OTH Season
# 0 2 0 48 Billy Elliot 1 0 20082009
# 1 0 0 10 next to normal 0 0 20082009
# 2 4 1 25 shrek 1 0 20082009
# 3 4 0 24 guys and dolls 3 0 20082009
# 4 0 0 28 west side story 18 0 20082009
# 5 1 0 20 pal joey 0 0 20082009
# drop the ID column since it is just a string
df = df.drop(['ID'], axis = 1)
# group by season and add the other columns
df = df.groupby('Season').sum()
print(df)
# AFRAM ASIAM CAU LAT OTH
# Season
# 20082009 11 1 155 23 0