bob手机客户端下载

bob手机客户端下载【网.址_yk490.COM】bob手机客户端下载【网.址_yk490.COM】bob手机客户端下载【网.址_yk490.COM】* 数据类型


```python
针对不同类型的数据用不同形式的方式对应 
```
  • 数据类型之整型与浮点型
  • 数据类型之字符串(str)

    '''引号引起来的内容'''
    三种定义方式
    '单引号'
    "双引号"
    '''三引号'''
    
    #字符中也含有引号,所有需要多种引号来确定引起的范围 
  • 数据类型之列表(list)

    []中括号括起来的内容
        中括号内可存放多个元素,元素元素之间用逗号分开,元素可以是任意类型的数据
    
    # 索引取值
        从零开始取值,在计算机中起始值是0 
  • 数据类型之字典(dict)

    大括号括起来的{}
    大括号内部可以存放多个元素,元素的形式是Key:Value键值对,key是对value的描述性数据,一般情况下都是字符串,value可以使任意的数据类型
    
    # 需要按键取值
        字典内是无序的无法按索引取值 
  • 数据类型之布尔值(bool)

    用于判断对错,真假
    True
    False
    1.布尔值默认为False
      0,None,'',[],{},...
    2.存储布尔值的变量名名一般都是习惯is开头
        is-rught=True
        is-delete=False 
  • 数据类型之元组

    小括号括起来的内容()
    小括号内部可以存放多个元素,元素与元素之间逗号隔开,并且元素只能是不可变类型 
  • 数据类型之集合

    大括号括起来的内容
    大括号内部可以存放多个元素,元素与元素之间逗号隔开,并且元素只能是不可变类型 
  • 输入与输出

    input
    print 
  • 格式化输出

    占位符
    %s %d
    
    %s可以替换任意数据类型
    %d只可以替换数字     #打破规则需要特殊方式 
  • 运算符

    数学运算
    
    比较运算
    
    增量赋值
    
    链式赋值
    
    解压赋值
    # 程序员要尽可能的简化自己的操作 
 # 今日内容概要

- 运算符之逻辑运算
- 运算符之成员运算
- 运算符之身份运算
- 流程控制(重点)
- 数据类型常用内置方法

# 今日内容详细

## 运算符之逻辑运算

逻辑运算用于连接多个条件,进行关联判断,会返回布尔值True或者false
与 and

或 or

非 not

and 连接多个条件判断都需要满足
2>1 and 1==1 and True and 3>2

True

2>3 and 1==1 and True and 3>2

False

or 连接多个条件只要有一个满足就输出 True
2>1 or 1==1 and True and 3>2

True

2>3 or 1==2 and False and 3>4

False

not 取反对结果反向取值
not 1 == 1

False

not 2>10

True

'''
上述三个逻辑顺序符组合在一起使用,是有先后顺序的

3>4 and 4>3 or 1==3 and 'x' == 'x' or 3>3

但是我们一般不应该考虑先后顺序,而应该主动使用括号的形式
明确使用的先后顺序
联想小学学习的加减乘除
通过使用括号打破顺序
(3>4 and 4>3) or ((1==3 and 'x' == 'x') or 3>3)
'''


运算符之成员运算
--------

判断个体是否属于某个群体内
in 存在
not in 不存在

names=['jason','tony','jerry']
name1='tom'
print(n in names)

False

name2= 'jason'
print(name2 in names)

True

取反

print(name1 not in names)

True

name2= 'jason'
print(name2 not in names)

False


逻辑运算之身份运算
---------

值是否想等

==

内存地址是否相等

is

l1 = [11,22,33,44]
l2 = [11,22,33,44]
print(l1 == l2)

True

print(l1 is l2)

Fales

print(id(l1),id(l2))

'''
内存地址命令 id
值相等内存地址可能不等
内存地址相等值一定相等
'''


流程控制
----

流程控制既是控制流程,具体指控制程序的执行流程,而程序的执行流程分为三种结构:
顺序结构

   之前我们写的代码都是顺序结构

分支结构

   用到if判断

循环结构

   用到while与for 

### 流程控制之分支结构

依据条件的真假进行判断做什么(让计算机模仿人类的思维模式)
使用
if
elif
else
判断运算的流程,三者只会有一个执行(执行了if就不会执行elif和else...同理...)

代码结构

if 条件1: # 如果条件1的结果为True,就依次执行:代码1、代码2,......
 代码1

代码2
......

elif 条件2: # 如果条件2的结果为True,就依次执行:代码3、代码4,......
 代码3

代码4
......

elif 条件3: # 如果条件3的结果为True,就依次执行:代码5、代码6,......
 代码5

代码6
......

else:   # 其它情况,就依次执行:代码7、代码8,......

代码7
代码8
......

'''条件可以使单个 也可以是用逻辑运算符链接的多个条件的组合'''

age=36
if age > 35:

print('阿姨好')

else:

print('小姐姐好')

用户的登录功能

获取用户的用户名和密码

username = input('username>>>:')
password = input('password>>>:')

判断用户名密码是否正确

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