根据列值在pandas DataFrame中重复行

reindex

repeat

df.reindex(df.index.repeat(df.persons))Out[951]:    pre  .     role ..1  persons0   123  .  Janitor   .        30   123  .  Janitor   .        30   123  .  Janitor   .        31   123  .  Analyst   .        21   123  .  Analyst   .        22   321  .   Vallet   .        22   321  .   Vallet   .        23   321  .  Auditor   .        53   321  .  Auditor   .        53   321  .  Auditor   .        53   321  .  Auditor   .        53   321  .  Auditor   .        5

PS：您可以添加

.reset_index(drop=True)