lishidefengchen

摘要： # -*- coding: utf-8 -*- def triangles(): n = 0 L = [1] while n < 20: yield L L = [1] + [L[i] + L[i+1] for i in range(n)] + [1] # n =0 时，循环语句【L[i] + L[i+1]】根本不会执行，所以不会报错 ... 阅读全文