python基础

导入getpass掩码模块：
1 import getpass
2 user =  raw_input("pls user:")
3 passwd = getpass.getpass("pls passwd:")
4 print(user,passwd)
输出的结果展示为：

 1 #每一行最多不能超过80字符
 2 user_input = input("input your name:")
 3 age_input = input("input your age:")
 4 work_input = input("input your work:")
 5 msg=‘‘‘
 6 Infomation of %s:
 7 -----------------
 8 Name : %s
 9 Age  : %s
10 Work : %s
11 -------End-------
12 ‘‘‘ %(user_input,user_input,age_input,work_input)
13 print(msg)

1 #在linux自己写的模块放在这个目录下：/usr/lib/python2.7/dist-packages，import便可直接导入
2 import sys
3 print(sys.path)#打印系统的环境变量

1 import os
2 os.system("dir f:\Java\code")#查看这个目录下的内容
3 
4 os.mkdir("han")#创建han文件夹
5 
6 cmd = os.popen("dir f:\Java\code").read()
7 print(cmd)  #将要查看的内容保存在一个变量里然后打印出来

 1 if语句 v1
 2 user = "han"
 3 passwd = "han"
 4 
 5 username = input("username:")
 6 password = input("password:")
 7 
 8 if user == username:
 9     print("user the same is username!")
10     if password == passwd:
11         print("welcome login!")
12     else:
13         print("password is invalid..")
14 else:
15     print("you get out!")

 1 if语句 v2
 2 user = "han"
 3 passwd = "kai"
 4 
 5 username = input("username:")
 6 password = input("password:")
 7 
 8 if user == username and passwd == password:
 9     print("welcome lgin!")
10 else:
11     print("invalid username or password..try again!")

 猜年龄：
 1 age = 26
 2 
 3 guess_num = int(input("input your guess num:"))
 4 
 5 if guess_num == age:
 6     print("Congratulations! you got it.")
 7 elif guess_num > age:
 8     print("think smaller!")
 9 else:
10     print("think big!")

 只能猜三次年龄：
 1 age = 26
 2 
 3 for i in range(10):
 4     if i < 3:
 5         guess_num = int(input("input your guess num:"))
 6 
 7         if guess_num == age:
 8             print("Congratulations! you got it.")
 9             break
10         elif guess_num > age:
11             print("think smaller!")
12         else:
13             print("think big!")
14     else:
15         print("Too many attempts..bye ")
16         break

 最终优化版
 1 age = 25
 2 
 3 counter = 0
 4 for i in range(10):
 5     if counter < 3:
 6         guess_num  = int(input("pls input an number:"))
 7         if guess_num == age:
 8             print("you are great!")
 9             break
10         elif guess_num > age:
11             print("the bigger")
12         else:
13             print("the smaller")
14     else:
15         continue_comfirm = input("do you want to continue?")
16         if continue_comfirm == "y":
17             counter = 0
18             continue
19         else:
20             print("bye")
21             break
22     counter += 1