python的流程控制学习

 _username= 'haozheyu'
 _password= ''
 username = input("请输入用户：")
 password = input("请输入密码：")
 if _username == username and _password == password :
     print ("你输入对了")
 else :
     print("用户或密码错误 "
           "invalid username or password")

text第一版

age_of_laochuanzhang = 56
age = int(input("请输入你的年龄："))
if age_of_laochuanzhang == age :
    print("yes, you got it.")
elif age_of_laochuanzhang > age:
    print("think smaller...")
else:
    print("think bigger!")

text第二版