python 基础课堂笔记

#Author:zyl
_username=‘zyl‘
_password= ‘zyl123‘
username= input("username:")

password = input("password:")
print(username,password)
if  _username== username  and  _password == password:

print("welcome  user  {name} login...".format(name=username))
else:

print("invalid  usernaem or  password!")

#indentationError表示缩进错误

#if和else后都必须加冒号“：”

#Author:zyl

age_of_oldboy = 56

guess_age = int(input("guess age:"))  #强制转换数据类型

if  guess_age == age_of_oldboy:

print("yes,you got it.")
elif  guess_age > age_of_oldboy:

print("think smaller...")
else:

print("think  bigger!")

#猜年龄运用 if 语句