penomoran sekuensial panda dalam grup
tmp = pd.DataFrame({'a':[1,1,2,2,3,1,2,3,1,3,1,2]})
tmp['sequential'] = tmp.groupby('a').cumcount()
tmp.sort_values('a')
Depressed Dog
tmp = pd.DataFrame({'a':[1,1,2,2,3,1,2,3,1,3,1,2]})
tmp['sequential'] = tmp.groupby('a').cumcount()
tmp.sort_values('a')