python break/continue（10）

In yesterday's article: the end of the python while circulating article, we left a bug, when the conditions are met, the program enters an infinite loop, how to solve it?

To circumvent this problem, today introduced two key words: BREAK and the Continue .

A .break

If a break in the cycle, meaning that immediately jump out of this cycle, direct code demonstrates:

# !usr/bin/env python
# -*- coding:utf-8 _*-
"""
@Author: Why grief
@Blog (personal blog address): shuopython.com
@WeChat Official Account (micro-channel public number): ape says python
@Github:www.github.com

@File:break_continue.py
@Time:2019/9/19 21:22

@Motto: short step a thousand miles, no small streams converge into a wonderful required the ocean, the program of life relentlessly accumulate!
"""

a = 0
the while True : # condition established forever, if not break, the cycle of death

    a + = 1 # is equivalent to a = a + 1, the cumulative value of a constant plus 1
    if a == 100 :
        BREAK # When a == 100, conditions are set up, break out of the loop, the program ends
    print("a = %d" % a)


print("循环结束，退出程序")

输出结果：

a = 1
a = 2
a = 3
a = 4
....
a = 96
a = 97
a = 98
a = 99
循环结束，退出程序

上面程序是前一篇文章的代码，while  True 死循环，当循环中的条件成立时，立即break退出循环。记住关键字break。

二.continue

如果在循环中使用 continue，意味着结束本次循环，继续下一次循环，直接代码演示：

a = 0
while True: # 条件永远成立

    a += 1 # 等价 a = a + 1,a 的值不停的累计加 1
    if a == 100:
        continue  # 当a == 100 ，条件成立时，continue 继续下次一循环
    print("a = %d" % a)


print("循环结束，退出程序")

输出结果：

a = 1
a = 2
a = 3
a = 4
...
a = 96
a = 97
a = 98
a = 99
a = 101
a = 102
a = 103
....

Program uses continue, into an infinite loop again, you noticed a small partner in the program printed to the console when, after 99 is 101, just not 100.

Because when a time value of 100 cycles continue executed, the program code will continue behind the skip codes, while loop back to the beginning .

 

The above also introduced the break and continue, to feel the difference between the two yet?

break is the end of the cycle, while the current sequential stop; continue is the end of this cycle, the next cycle to continue, in fact, the cycle has not stopped .

III. Key summary

while loop using break and continue keywords is essential, note the difference between the two

break: jump out of this cycle

continue: the end of this cycle, the next cycle continues

 

 

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