wk1-if_else,及隐藏密码简单模块

##输入时隐藏密码##
import getpass  #调用模块
username = input("your name:")
password = getpass.getpass("your password:")
print(username, password)

_username = "yu"
_password = "111"
username = input("username:")
password = input("password:")
if _username == username and _password == password:  ##双等号代表等于，单等号是赋值。
    print("welcome {name} login..".format(name=username))
else:
    print("invalid username or password")

猜年龄：

age_of_yu = 19
guess_age = int(input("guess age:"))
if guess_age == age_of_yu:
    print("correct!")
elif guess_age > age_of_yu :
    print("it's too big")
else:
    print("it' too small")