朝文分享（14）：Python入门指南（四）-while语句篇

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一、while语句

While语句是循环语句的一种。先通过条件判断，如果满足条件，就执行内部的指令，直到不满足该条件为止。如果本就不满足条件，那么不执行内部指令。下面是一段猜数字的代码。获取随机数需要导入random，用random.randint语句获取区间内的随机数。循环内用到上次学习的if语句对所猜数字比答案大还是小。每循环一次，i值增加1一次，用于记录猜的次数。

The While statement is a type of loop statement. If the condition is met, the internal instruction is executed until the condition is not met. If the condition is not met, the internal instruction is not executed. Here is a piece of code to guess the number. To obtain random numbers, you need to import random, and use random.randint statement to obtain random numbers within the interval. The loop uses the if statement learned last time to determine whether the number guessed is greater or smaller than the answer. For each cycle, the value of i is increased by 1, which is used to record the number of guesses.

二、while语句的嵌套

While语句中包含另外的while语句，这就叫while语句的嵌套，用于解决多重循环问题。下面是一段送花表白的代码。如果用一层表白的循环，里面送花的代码就要写十条，很麻烦；如果只用送花的循环，外面表白的代码就要写一百次，更麻烦。所以，这里用到while语句的嵌套，轻松实现多重循环。

The While statement contains another while statement, which is called the nesting of while statements, to solve the problem of multiple loops. The following is a piece of flower confession code. If you use a layer of confession of the cycle, inside the flower code to write ten, very troublesome; If you only use the cycle of sending flowers, the code outside will be written a hundred times, which is more troublesome. Therefore, the nested while statement is used here to easily implement multiple loops.

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