python判断int列表是否有五个相连数字(可用于五子棋)

代码如下，不懂可留言：

#!/usr/bin/env python3
#-*- coding:utf-8 -*-
num = [13,25,77,88,96,90,12,45,64,4,7,24,56,8,78,89,14,91,92]
num.sort()
print(num)
def sorts() :
   n = 0
   j = 0
   n = num[0]
   for i in num :
      if i == n :
         n = i + 1
         j = j + 1
         if j >= 5:
             print ('成功')
             return
      else:
         n = i
         n = n + 1
         j = 1
sorts()