01-python3.5-模块导入-while-for-range-break-continue

一、输入用户名和密码----导入getpass模块

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 """
 name = input("What's your name ?")
 print("Hello！ " +  name)

 """
 #########
 #输入密码时，如果想要不可见，需要利用getpass 模块中的 getpass方法，即：
 import getpass

 _username = 'alex'
 _password = 'abc123'
 username = input( "username:")
 # 将用户输入的内容赋值给 password 变量
 password = getpass.getpass("password:")

 #getpass在pycharm中不太好用，建议使用window命令行测试如：

 # E:\Users\admin>python I:\pycharm\PycharmProjects\20180908PY\20190908\1-day1-01.py
 # username:alex
 # password:
 # alex aaaa
 # E:\Users\admin>

 if _username == username and _password == password:
     print("Welcome user {name} login...".format(name=username))
 else:
     print("Invalid username or password !")

 print(username,password)

二、通过while循环猜年龄

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 age_of_oldboy = 56

 count = 0

 while count < 3:
     guess_age = int(input("guess age:"))

     if guess_age == age_of_oldboy:
         print("yes, you get 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.. fuck off")

三、while循环打印到1亿的数字

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 count = 0

 while True:
     print("count:",count)
     count = count + 1   #count +=1
     if count == 100000000:
         break

四、range循环打印0-9的数字

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 for i in range(10):
     print("loop",i)

五、通过range设置猜年龄游戏3次猜错强制退出

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 age_of_oldboy = 56

 for i in range(3):
     guess_age = int(input("guess age:"))

     if guess_age == age_of_oldboy:
         print("yes, you get it.")
         break
     elif guess_age > age_of_oldboy:
         print("Think smaller!")
     else:
         print("Think bigger!")
 else:
     print("you have tried too many times.. fuck off")

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 age_of_oldboy = 56

 count = 0

 while count < 3:
     guess_age = int(input("guess age:"))

     if guess_age == age_of_oldboy:
         print("yes, you get 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
 else:
     print("you have tried too many times.. fuck off")

六、通过range循环打印10以内的偶数

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ
 for i in range(0,11,2):
     print("loop",i)

七、循环中break和continue的使用

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 for i in range(1,10):
     if i < 3:
         print("loop",i)
     else:
         continue
     print("hehe...")
 #continue 跳出本次循环，进入下一次循环
 #break 结束整个循环

 #!/usr/bin/env python
 # -*- coding:utf-8 -*-
 #Author:XZ

 for i in range(10):
     print('------------',i)
     for j in range(10):
         print(j)
         if j > 5:
             break