根据条件替换熊猫中的值

Question

如果状态列为SCN ISSUED并且FSCN ISSUED列大于20，我尝试将状态列从SCN ISSUED更新为Days，我写了下面一行突出显示错误

currenteod = eod.where((eod['Status']=="SCN ISSUED" & eod['Days']>20),eod['Status']="FSCN ISSUED")

Cannot Assign to Function Call