1 getpass模块 设置密码不显示明文

 

用户名和密码输入程序：

import getpassusername = input("username:")password = getpass.getpass("password:")print(username,password)

 

判断登录

_username = "jj"_password = '123456'username = input("username:")password = getpass.getpass("password:")if _username == username and _password==password:    print('welcome login..')else:    print('Invalid username or password')

 

猜年龄：

age_jj = 35guess_age = int(input('guess age:'))if guess_age == age_jj:    print('YES')elif guess_age > age_jj:    print('think smaller..')else:    print("think bogger..")

猜3次 猜对了就退出，错误次数达到3次也退出

while 

while 条件   循环语句 如果提交为真就一直执行

age_jj = 35count = 0while count< 3 :    guess_age = int(input('guess age:'))    if guess_age == age_jj:        print('YES')        break    elif guess_age > age_jj:        print('think smaller..')    else:        print("think bogger..")    count += 1

age_jj = 35count = 0while count< 3 :    guess_age = int(input('guess age:'))    if guess_age == age_jj:        print('YES')        break    elif guess_age > age_jj:        print('think smaller..')    else:        print("think bogger..")    count += 1else:    print('you have tried too many times.. fuck you..')

while else"

如果while 的条件为真 就一直执行while 里面的代码

如果while的条件为假 就执行else里面的代码

for　　

　　Python的for循环有两种：

1 利用range()函数生成一个整数序列。

print(type(range(10)))for i in range(10):    print(i)

 

这个序列可以转成列表

print(list(range(10)))

 

2 for ..in 循环列表，依次把列表中的元素迭代出来

　

names=['michael','Bob','Tracy']for name in names:    print(name)