大侠来帮忙看看。数据转换遇到TypeError: not all arguments converted during string formatting

Question

# -*- coding: utf-8 -*- sj='C:\\Users\\wt271\\Desktop\\jc\\passenger.txt'  sa=[] with open(sj) as b:     sjj=b.read() def s(ss,n):          return [ss.append(sjj[i]) for i in sjj if i%n==0] s(sa,3)          print(sa)cmd运行后如下C:\Users\wt271>python C:\Users\wt271\Desktop\sj.pyTraceback (most recent call last):  File "C:\Users\wt271\Desktop\sj.py", line 10, in <module>    s(sa,3)  File "C:\Users\wt271\Desktop\sj.py", line 9, in s    return [ss.append(sjj[i]) for i in sjj if i%n==0]  File "C:\Users\wt271\Desktop\sj.py", line 9, in <listcomp>    return [ss.append(sjj[i]) for i in sjj if i%n==0]TypeError: not all arguments converted during string formatting