Python：if语句

#!/usr/bin/python
# coding=utf-8
# Filename:iftest.py
num = 23
i = int(raw_input("input a number: "))

if i == num:
        print 'right!'
        print 'have no prise'
elif i > num:
        print 'guess bigger'
else:
        print 'guess smaller'

print 'done.'

要点：

if-elif-else后面要加冒号
靠缩进区分子语句块
raw_input内置函数参数和返回都为字符串
python中没有switch语句