how to calculate mean experience via designation using dataframe groupby code example

Example 1: average within group by pandas

In [57]: df.groupby(['cluster', 'org']).mean()
Out[57]:
               time
cluster org
1       a    438886
        c        23
2       d      9874
        h        34
3       w         6

Example 2: pandas groupby mean

df.groupby(['A', 'B']).mean()