python 循环while和for in

#!/uer/bin/env python
# _*_ coding: utf-8 _*_

lucknumber = 5
b = 0

while b <3:
    print('guss count:',b)
    a = int(input('you guse number'))
    if a > lucknumber:
        print  ('youaerbiger')
    elif a == lucknumber:
        print ('youare righet')
        break                                 #跳出这个层级的循环
    else :
        print ('you aer smaller')
    b  +=1                                   #在while循环中，+=1 是必须循环体
else:
    print ("Too many retrys!")

#________________________________________________

for i in range(3):
    a = int(input('you guse number'))      #注意用int（）表示输出的是 数字类型
    if a > lucknumber:
        print  ('youaerbiger')
    elif a == lucknumber:
        print ('youare righet')
        break
    else :
        print ('you aer smaller')
else:
    print ("Too many retrys!")