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Simple Dataset for Pandas Groupby
 Example    
 import pandas as pd
import numpy as np
df = pd.DataFrame( {     
"Employee" : ["Susan", "Kevin", "Charles", "David", "Ben"] ,           
"Salary" : [60000, 35000, 31000, 10000, 20000] ,
"Year" : [2019, 2019, 2019, 2019, 2019]} ) 
df