Python while else 语句

Python while else 语法有点特别，在其它的编程语言中是没有这种语法结构，其语法结构如下：

while [boolean expression]:
    statement1
    statement2
    ...
    statementN
else:
    else_statement1
    else_statement2
    ...
    else_statementN 

举例说明Python while else 语法：

#!/usr/bin/python
# coding=utf-8

num =0
while num < 5:
    num = num + 1
    print('num = ', num)
else:
    print('此时num大于等于5')