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,无涯教程可以说使用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。
break的语法如下。
#loop statements break;
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
输出:
p y t h
i = 0; while 1: print(i," ",end=""), i=i+1; if i == 10: break; print("came out of while loop");
输出:
0 1 2 3 4 5 6 7 8 9 came out of while loop
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
输出:
2 X 1 = 2 2 X 2 = 4 2 X 3 = 6 2 X 4 = 8 2 X 5 = 10 2 X 6 = 12 2 X 7 = 14 2 X 8 = 16 2 X 9 = 18 2 X 10 = 20 Do you want to continue printing the table, press 0 for no?1 3 X 1 = 3 3 X 2 = 6 3 X 3 = 9 3 X 4 = 12 3 X 5 = 15 3 X 6 = 18 3 X 7 = 21 3 X 8 = 24 3 X 9 = 27 3 X 10 = 30 Do you want to continue printing the table, press 0 for no?0
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