今天接触Python ,非常有趣。现在慢慢总结，记录如下：

字符串运用：

方法一

1 name = "lili"
2 name2 = "leilei"
3 print("My name is ",name)
My name is  lili

方法二

1 name = "lili"
2 name2 = "leilei"
3 print("{name} is my best friend".format(name = name2))
leilei is my best friend

方法三

1 name = "lili "

2 print(name + "is a girl") 

lili is a girl

  以上就是我学习的三种方法

  if 循环语句运用

运用if...else....条件语句，已知登录用户名与密码，判断输入登录用户名与密码是否正确，并给出相关提示语

 1 _name = "lili"
 2 _password = "123wer"
 3 
 4 Username = input("name:")
 5 Password = input("Password:")
 6 
 7 if _name == Username and _password == Password:
 8     print("Welcome {name} losding!".format(name = Username))
 9 else:
10     print("Please try again!")
name:lili
Password:123wer
Welcome lili losding!

 while条件语句用法：

猜数字，有三次猜数字机会，超过三次就自动退出，正确就自动终止

 1 _age = 99
 2 count = 0
 3 
 4 
 5 while count < 3:
 6     age = int(input("Put my age:"))
 7     if _age == age:
 8         print ("Well done")
 9         break
10     elif _age < age:
11         print ("Think smaller")
12 
13     else:
14 
15         print ("Think bigger")
16     count += 1
17 else:
18 
19     print ("you try too many times")

for 循环：

从range 列表中，以0为起始数，10做结尾，间隔2个数，排列出其他数

1 for i in range(0,10,2)：

2 print("name",i) 

 

name 0
name 2
name 4
name 6
name 8

 题目：

输入用户名和密码注册，然后用用户名和密码登录，一共有三次登录机会。

 1 # -*- coding:utf-8 -*-
 2 # Author: Tan
 3 
 4 
 5 print("************* Please register your massage***********")
 6 _Usename = input ("your name : ")
 7 _Password = input ("your password: ")
 8 
 9 count = 0
10 
11 while count < 3:
12     print("*************Please write your massage***********")
13     _name = input("your name : ")
14     _Password = input("your password: ")
15 
16     if _Usename == _name and _Password == _Password:
17         print("Welcome {0} come here......".format(_name))
18         break
19     else:
20         print("You ony have {0} times".format(2-count))
21         count += 1
22 
23 else:
24     print("Please try to retrieve the password")