老男孩教学学习笔记：
实例1：格式化输出
# Author:Alex Li
name = input("name:")
# raw_input 2.x input 3.x
# input 2.x =
age = int(input("age:")) # integer
print(type(age), type(str(age) ))
job = input("job:")
salary= input("salary:")
info = '''
-------- info of %s -----
Name:%s
Age:%d
Job:%s
Salary:%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 Li import 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 = 56
guess_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 Li age_of_oldboy = 56 count = 0
while 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
else:
print("you have tried too many times..bye")
循环学习：
# Author:Alex Li
'''
count = 0
while 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 Li age_of_oldboy = 56 count = 0
while 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