How to write python loop statement

The while statement in Python programming is used to execute programs 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 Is a single statement or block of statements. 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, and 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 = 1
while 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 = 1
while 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

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