How to use python's while

Python While loop statement

The while statement in Python programming is used to execute the program in a loop, that is, under certain conditions, execute a certain program in a loop , to handle the same tasks that need to be processed repeatedly.

The basic form is:(Recommended learning:Python video tutorial)

while 判断条件： 执行语句……

The execution statement can be a single statement or statement block. The judgment condition can be any expression, and any non-zero or non-null value is true.

When the judgment condition is false, the loop ends.

There are two other important commands in the while statement: continue, break is used to skip the loop, continue is used to skip the loop, break is used to exit the loop, in addition" The judgment condition "can also be a constant value, indicating that the loop must be established. The specific usage is as follows:

# continue 和 break 用法 i = 1while i < 10: i += 1 if i%2 > 0: # 非双数时跳过输出 continue print i # 输出双数2、4、6、8、10 i = 1while 1: # 循环条件为1必定成立 print i # 输出1~10 i += 1 if i > 10: # 当i大于10时跳出循环 break

Loop uses the else statement

In python, while...else is in the loop When the condition is false, the else statement block is executed:

#!/usr/bin/python count = 0 while count < 5: print count, " is less than 5" count = count + 1 else: print count, " is not less than 5"

The output result of the above example is:

0 is less than 5 1 is less than 5 2 is less than 5 3 is less than 5 4 is less than 5 5 is not less than 5

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