group by and sum in pandas code example

Example 1: pandas groupby sum

df.groupby(['Fruit','Name'])['Number'].sum()

Example 2: pandas groupby sum

df.groupby(['att1', 'att2']).agg({'att1': "count", 'att3': "sum",'att4': 'mean'})

Example 3: pandas sum group by

df.groupby(['Fiscal_Year','Billing_Group'])['CHARGE_AMT'].sum()