python, my first code

# coding:utf-8

from random import randint

num=randint(1,100)

print "guess the right number ,so please input a number:"

a=1

while a==1:

answer=input() ##把输入赋值给answer以便条件中用到比较大小

if answer<num :

print "it‘s too small"

if answer>num :

print "it‘s too big"

if answer==num :

print "right"