1、变量,编码,print,模块调用,数据类型(数字/浮点数/字符串等),数据运算,if else,for,while,break,continue

# -*- coding:utf8 -*-
name = "Newname"

name1 = "Nename"
name2 = "name1

name1 ="Oldname"

print(name1)
print(name2)

1 #!/usr/bin/env python
2 print "你好，世界"

1 #!/usr/bin/env python
2 # -*- coding: utf-8 -*-
3 
4 print "你好，世界"

1 #!/usr/bin/env python
2 #_*_coding:utf-8_*_
3  
4  
5 #name = raw_input("What is your name?") #only on python 2.x
6 name = input("What is your name?")
7 print("Hello " + name )

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3   
 4 import getpass
 5   
 6 # 将用户输入的内容赋值给 name 变量
 7 pwd = getpass.getpass("请输入密码：")
 8   
 9 # 打印输入的内容
10 print(pwd)

import sys as s#s.xx 可以调用sys模块的xx方法
import sys #sys.xx 可以调用sys模块的xx方法
from sys import xx#可以调用 sys模块的xx方法
from sys import * #可以调用sys模块的所有方法,则不需要输入sys前缀

 1 # -*- coding:utf8 -*-
 2 __author__ = ‘Administrator‘
 3 
 4 name = input("name:")
 5 age = int(input("int,age:"))#强制转换成整数
 6 print(type(age))
 7 age2 = input("str,age2:")#未转换则为字符串格式
 8 print(type(age2))
 9 job = input("job:")
10 
11 #第一种格式化方法(推荐)
12 info1 = """
13 ------info {_name}------
14 name:{_name}
15 age:{_age}
16 age2:{_age2}
17 job:{_job}
18 """.format(_name = name,_age = age,_age2 = str(age2),_job=job)#格式化输出
19 print("第一种格式化方法",info1)
20 
21 #第二种格式化方法
22 info2 = """
23 ------info {0}------
24 name:{0}
25 age:{1}
26 age2:{2}
27 job:{3}
28 """.format(name,age,str(age2),job)#格式化输出
29 print("第二种格式化方法",info2)
30 
31 #第三种格式化方法
32 info3 = """
33 ------info %s------
34 name:%s
35 age:%d
36 age2:%s
37 job:%s
38 """ %(name,name,age,age2,job)#格式化输出  %s格式化字符串(s为str首字母) %d 格式化整数
39 #%d,用来输出十进制整数
40 #%f,用来输出实数（包括单，双精度），以小数形式输出
41 #%c,用来输出一个字符
42 #%s,用来输出一个字符串
43 print("第三种格式化方法",info3)
44 
45 #python2.x 的 raw_input  = python3.x 的 input
46 #python2不要直接使用input

name_list = [‘alex‘, ‘seven‘, ‘eric‘]
或
name_list ＝ list([‘alex‘, ‘seven‘, ‘eric‘])

ages = (11, 22, 33, 44, 55)
或
ages = tuple((11, 22, 33, 44, 55))

person = {"name": "mr.wu", ‘age‘: 18}
或
person = dict({"name": "mr.wu", ‘age‘: 18})

 1 #!/usr/bin/env python
 2 # -*- coding:utf8 -*-
 3 import getpass
 4 _username = "admin"
 5 _password = "qwe123456"
 6 username = input("username:")
 7 #password = getpass.getpass("password:")#在CMD中测试
 8 password = input("password:")#在CMD中测试
 9 if _username == username and _password == password:#双等于是等于,单等于是赋值
10     print("Welcome user {name} login...".format(name = username))
11 else:
12     print("Invalid username or password!")

 1 #!/usr/bin/env python
 2 # -*- coding:utf8 -*-
 3 ‘‘‘
 4 xx_age = 21
 5 for i in range(3):
 6     guess_age = int(input("guess age of xx:"))
 7     if guess_age == xx_age:
 8         print("yes,you got it")
 9         break  # 跳出循环
10     elif guess_age > xx_age:  # 如果大于， elif = else if
11         print("think smaller...")
12     else:
13         print("think bigger...")
14 
15 else:  # while 和 else 一起使用,意思是 如果while的条件不满足 执行else的内容,也就是当count≥3时
16     print("you have tride too many times..fuck off")
17 ‘‘‘
18 ‘‘‘
19 for i in range(10):
20     if i%2 == 0:
21         print(i)
22 ‘‘‘
23 ‘‘‘
24 for i in range(0,10,2):#开始数0,结束数10,步长2,0-10范围内每次叠加2
25     print(i)
26 
27 print(help(range))
28 ‘‘‘
29 ‘‘‘
30 for i in range(10):
31     if i < 3:
32         print("loop",i)
33     else:
34         continue#跳出此次循环,进行下一轮循环 beark跳出整个循环
35     print("heh...")
36 ‘‘‘
37 for i in range(10):
38 
39     print("-------",i)
40     for j in range(10):
41         print(j)
42         if j > 5:
43             break #到5就跳出整个小循环

 1 #!/usr/bin/env python
 2 # -*- coding:utf8 -*-
 3 
 4  #判断三次
 5 ‘‘‘
 6 xx_age = 21
 7 count = 0
 8 
 9 while count <3:
10     guess_age = int(input("guess age of xx:"))
11     if guess_age == xx_age:
12         print("yes,you got it")
13         break#跳出循环
14     elif guess_age > xx_age:#如果大于， elif = else if
15         print("think smaller...")
16     else:
17         print("think bigger...")
18     count += 1
19     print("count:", count)
20 else:#while 和 else 一起使用,意思是 如果while的条件不满足 执行else的内容,也就是当count≥3时
21     print("you have tride too many times..fuck off")
22 ‘‘‘
23 ‘‘‘#每次都询问
24 xx_age = 21
25 while 1:
26     guess_age = int(input("guess age of xx:"))
27     if guess_age == xx_age:
28         print("yes,you got it")
29         break#跳出循环
30     elif guess_age > xx_age:#如果大于， elif = else if
31         print("think smaller...")
32     else:
33         print("think bigger...")
34 
35     next = input("继续吗?输入q/Q继续,输入任意退出")
36     if next == "q" or next == "Q":
37         continue
38 
39 ‘‘‘
40 
41 ‘‘‘#每三次询问一次
42 xx_age = 21
43 count = 0
44 while count<3:
45     guess_age = int(input("guess age of xx:"))
46     if guess_age == xx_age:
47         print("yes,you got it")
48         break#跳出循环
49     elif guess_age > xx_age:#如果大于， elif = else if
50         print("think smaller...")
51     else:
52         print("think bigger...")
53     count +=1
54 
55     if count == 3:
56         countine_confirm = input("do you want to keep gussing..?")
57         if countine_confirm != "n":
58             count = 0
59 ‘‘‘