老男孩教学学习笔记：

 

 实例1：格式化输出

# Author:Alex Liname = input("name:")# raw_input 2.x   input 3.x# input 2.x =age = int(input("age:"))  # integerprint(type(age), type(str(age) ))job = input("job:")salary= input("salary:")info = '''-------- info of  %s  -----Name:%sAge:%dJob:%sSalary:%s''' % (name, name, age, job, salary)info2 = '''-------- info of {_name}  -----Name:{_name}Age:{_age}Job:{_job}Salary:{_salary}'''.format(_name=name,           _age=age,           _job=job,           _salary=salary)info3 = '''-------- info of {0} -----Name:{0}Age:{1}Job:{2}Salary:{3}'''.format(name, age, job, salary)print(info)print(info2)print(info3)

 

实例2：密码密文输入

# Author:Alex Liimport getpass_username = 'alex'_password = 'abc123'username = input("username:")# password = getpass.getpass("password:")password = input("password:")if _username == username and _password == password:    print("Welcome user {name} login...".format(name=username))else:    print("Invalid username or password!")

 

实例3：

猜年龄（一次）

# Author:Alex Li age_of_oldboy = 56guess_age = int(input("guess age:"))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（多次）——循环

# Author:Alex Liage_of_oldboy = 56count = 0while count < 3:    guess_age = int(input("guess age:") )    if guess_age == age_of_oldboy:        print("yes, you got it. ")        break    elif guess_age > age_of_oldboy:        print("think smaller...")    else:        print("think bigger!")    count += 1else:    print("you have tried too many times..bye")

循环学习：

# Author:Alex Li'''count = 0while True:    print("count:",count)    count = count +1  #count +=1    if count == 1000:        break''''''for i in range(0,10):    if i <3:        print("loop ",i)    else :        continue    print("hehe...")'''for i in range(10):    print('----------',i)    for j in range(10):        print(j)        if j > 5:            break

循环结束后询问是否继续：

# Author:Alex Liage_of_oldboy = 56count = 0while count < 3:    guess_age = int(input("guess age:") )    if guess_age == age_of_oldboy :        print("yes, you got it. ")        break    elif guess_age > age_of_oldboy:        print("think smaller...")    else:        print("think bigger!")    count += 1 if count == 3:        countine_confirm = input("do you want to keep guessing..?")        if countine_confirm != 'n':            count = 0

 

作业：

一、编写登录接口：

　　1、输入用户名密码

　　2、认证成功后显示欢迎信息

　　3、用户名3次输入错误后，退出程序

　　4、密码3次输入错误后，锁定用户名

二、多级菜单

　　三级菜单

　　可依次选择进入各子菜单

　　所需知识点：列表、字典