bank.job.value_counts()
management 969 blue-collar 946 technician 768 admin. 478 services 417 retired 230 self-employed 183 entrepreneur 168 unemployed 128 housemaid 112 student 84 unknown 38 Name: job, dtype: int64
ちなみにある列の総数を集計する場合は下記
bank.job.count()
4521