python random

　随机数

import  random
print random.random() 
print random.randrange(1,10) 
print random.randint(1,10)

验证码
import random
checkcode='' 
for i in range(1,5):
 if i==random.randint(1,4):         
　　temp=chr(random.randint(65,121))     
else:         
　　temp=random.randint(1,9)     
checkcode+=str(temp) 
print checkcode