Python day1 变量、字符编码、用户交互程序、if、while

一、变量

 1 #!/usr/bin/env python
 2 # -*- utf-8 -*-
 3 # Author:Wang Lulu
 4 name ="Wang Lulu"  #变量赋值
 5 name2 = name   #变量赋值可以使用变量（这里name2是指向Wanglulu的并不随着name变量的变化而变化）
 6 print("Hello world")  #输出格式
 7 print("My name is ",name,name2)  #输出格式
 8 name = "Fan Shuangshuang"
 9 print(name,name2)
10 GF_of_Wanglulu = "Fan Shuangshuang"   变量定义规则（1一般以下划线区分2可以下划线开头但是最多写两个3或者利用字母开头大写区分）
11 GFOfWanglulu = "Fan Shuangshuang"
12 print("I Love You",GF_of_Wanglulu)

二、字符编码
1 2 4 8 16 32 64 128 256

1 1 1 1 1 1 1 1 1

2**0 2**1 2**2 2**3 2**4 2**5 2**6 2**7 2**8
2=1+1
4=2+1+1
8=4+2+1+1
16=8+4+2+1+1

ASCII 最多只能用8位来表示（一个字节），即2**8=256-1，所以ASCLL只能最多表示255个符号
127个西方的字符（包括字母数字特殊符号）预留了128-256之间的给其他国家用
GB2312     1980年   7445个字符
GBK1.0     1995年   21886个符号
GB18030    2000年   27484个汉字

Unicode(万国编码，单一码) 统一2bytes
UTF-8 英文：1bytes 中文：3bytes
python3比python2相比3支持中文，默认使用的是utf-8字符集

三、用户交互程序
1、python的注释
单行注释 #
多行注释 '''开始'''结束
'''还有一个用途打印多行
例：msg = '''
name ="Wang Lulu"
name2 = name
print("Hello world")
print("My name is ",name,name2)
'''
print(msg)

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Wang Lulu
'''
username = input("username:")
password = input("password")
raw_input 2.x input 3.x
input 2.x (接受的是变量，输入的是变量，找不到就会报错必须先定义一个变量)
print(username,password)
'''
name = input("Name:")
age = int(input("Age:")) #interger 整型字符串转换整型
print(type(age) ,type( str(age) )) #str(age) 整型转换字符串
job = input("Job:")
salary = int(input("Salary:"))
格式化输出
%d data 数字
%s string 字符
%f 浮点类型，小数一般不常用
1、info = '''
-------------info of ''' +name+'''-----------
Name:'''+name+'''
Age:'''+age+'''
job:'''+job+'''
Salary:'''+salary
'''
print(info)

2、
name = input("Name:")
age = input("Age:")
print(type(age) ,type( str(age) ))
job = input("Job:")
salary = int(input("Salary:"))
info ='''
--------------info of %s--------------
Name:%s #string 字符串
Age:%s
job:%s
Salary:%s
'''%(name,name,age,job,salary)
print(info)

3、
name = input("Name:")
age = int(input("Age:")) #interger 整型字符串转换整型
print(type(age) ,type( str(age) ))
job = input("Job:")
salary = int(input("Salary:"))
info ='''
--------------info of %s--------------
Name:%s #string 字符串
Age:%d #只等接收数字字符类型为数字 %f 浮点，指小数
job:%s
Salary:%d
'''%(name,name,age,job,salary)
print(info)

4、
name = input("Name:")
age = int(input("Age:")) #interger 整型字符串转换整型
print(type(age) ,type( str(age) ))
job = input("Job:")
salary = int(input("Salary:"))
info2 ='''
--------------info of {_name}--------------
Name:{_name}
Age:{_age}
job:{_job}
Salary:{_salary}
'''.format(_name=name,
           _age=age,
           _job=job,
           _salary=salary)
print(info2)

5、name = input("Name:")
age = int(input("Age:")) #interger 整型字符串转换整型
print(type(age) ,type( str(age) )) #str(age) 整型转换字符串
job = input("Job:")
salary = int(input("Salary:"))
info3 ='''
--------------info of {0}--------------
Name:{0}
Age:{1}
job:{2}
Salary:{3}
'''.format(name,age,job,salary)
print(info3)
四、if、else判断语法

1、#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Wang Lulu

import getpass
_username = "WangLulu"
_password = "oracle123"
username = input("Pleace input your username:")
#password = getpass.getpass("Pleace input your password:")获取密码不显示
password = input("Pleace input your password:")
print(username,password)

if _username == username and _password == password:
print("Welocome user {name} login...".format(name=username))
else :
print("Invalid username or password!")
2、#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Wang Lulu

age_of_FanShuangshuang = 13

guess_age = int(input("Guess age:"))

if guess_age == age_of_FanShuangshuang:
    print("Yes,you got it.")
elif guess_age > age_of_FanShuangshuang:
    print ("Think amaller....")
else:
    print("Think bigger!")
五、while循环
1、#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Wang Lulu

count = 0
while True:
print("count:",count)
count = count +1 #count +=1

2、#!/usr/bin/env python
# -*- coding:utf-8 -*-
# Author:Wang Lulu

age_of_FanShuangshuang = 13
count = 0
while True:          ------------------------->>>                                            等价于 while count<3
    if count ==3:
        break
    guess_age = int(input("Guess age:"))
    if guess_age == age_of_FanShuangshuang:
       print("Yes,you got it.")
       break
    elif guess_age > age_of_FanShuangshuang:
       print ("Think amaller....")
    else:
       print("Think bigger!")
    count +=1

人性化提示
age_of_FanShuangshuang = 13
count = 0
while True:
    if count ==3:
        break
    guess_age = int(input("Guess age:"))
    if guess_age == age_of_FanShuangshuang:
       print("Yes,you got it.")
       break
    elif guess_age > age_of_FanShuangshuang:
       print ("Think amaller....")
    else:
       print("Think bigger!")
    count +=1
if count ==3: #等价于else:
    print("You have tried too many times...fuck off")

来源：https://www.cnblogs.com/Wll-Fss/p/6848623.html

标签

input

python

字符编码

整型变量

编码转换

info

guess