求各位大佬解答一下我的问题：我的代码出现了什么问题
程序代码：
with open("prime_numbers_file.txt", "a+") as file:
prime_numbers = file.read()
a = b = 0
c = prime_numbers.split()
d = len(c) ** 2 - 1
e = c[-1]
f = 1
程序代码：
程序代码：
with open("prime_numbers_file.txt", "a+") as file:
prime_numbers = file.read()
a = b = 0
c = prime_numbers.split()
d = len(c) ** 2 - 1
e = c[-1]
f = 1
2020-08-07 22:59
2020-08-08 12:41
2020-08-08 21:00