Python break语句用法示例 _Python最新开发教程

本文概述

例子1
例子2
示例3：带有while循环的break语句
例子3

break是python中的关键字, 用于将程序控制带出循环。 break语句逐个中断循环, 即在嵌套循环的情况下, 它首先中断内部循环, 然后继续进行外部循环。换句话说, 我们可以说使用break来中止程序的当前执行, 并且控制转到循环后的下一行。
该中断通常用于需要为给定条件中断循环的情况下。
中断的语法如下。

#loop statements break;

例子1

list =[1, 2, 3, 4] count = 1; for i in list: if i == 4: print("item matched") count = count + 1; break print("found at", count, "location");

输出

item matched found at 2 location

例子2

str = "python" for i in str: if i == 'o': break print(i);

输出

p y t h

示例3：带有while循环的break语句

i = 0; while 1: print(i, " ", end=""), i=i+1; if i == 10: break; print("came out of while loop");

输出

0123456789came out of while loop

例子3

n=2 while 1: i=1; while i< =10: print("%d X %d = %d\n"%(n, i, n*i)); i = i+1; choice = int(input("Do you want to continue printing the table, press 0 for no?")) if choice == 0: break; n=n+1

【Python break语句用法示例】输出

2 X 1 = 22 X 2 = 42 X 3 = 62 X 4 = 82 X 5 = 102 X 6 = 122 X 7 = 142 X 8 = 162 X 9 = 182 X 10 = 20Do you want to continue printing the table, press 0 for no?13 X 1 = 33 X 2 = 63 X 3 = 93 X 4 = 123 X 5 = 153 X 6 = 183 X 7 = 213 X 8 = 243 X 9 = 273 X 10 = 30Do you want to continue printing the table, press 0 for no?0