pandas dataframe group year index by decade

Question

suppose I have a dataframe with index as monthy timestep, I know I can use dataframe.groupby(lambda x:x.year) to group monthly data into yearly and apply other oper

Answer 1

if your Data Frame has Headers say : DataFrame ['Population','Salary','vehicle count']

Make your index as Year: DataFrame=DataFrame.set_index('Year')

use below code to resample data in decade of 10 years and also gives you some of all other columns within that dacade

datafame=dataframe.resample('10AS').sum()