我们先知道某一列是否有重复值，并将这些重复值找出来
a = zongti.groupby(\'reportno\').count()>1 a[a[\'ref_id\'] == True].index #里面的列，随便一列都行
结果：
Index([\'2016122100003477314271\', \'2017011100003543220588\',
\'2017012000003575254500\', \'2017012400003588159436\',
\'2017020700003607883826\', \'2018041300005391719350\',
\'2018041600005402623170\', \'2018042000005423149388\',
\'2019010900006795508613\'],
dtype=\'object\', name=\'reportno\')
即可