Python入门注释和变量

深碍√TFBOYSˉ_ 2024-03-30 14:48 71阅读 0赞

### 1.1计算机的基本原理![e3a07ec8abfb4e859a89024b8fcc228a.png][] ###

### 1.2 计算机的组成 ###

![955e0432f4a64c7d94000924a452f08f.png][]![1585285f8e8e4362975295b69d6c2ece.png][]![ffbf8f05e5b6423c9ffac86c78f27f51.png][]![223da0517f9c4de0a6704e8b85cae95f.png][]

![2d0201b323564a1ead4b8b4f9eb59ec7.png][]![7e1f7541237d4ca3b39c112f27709693.png][]![95708f6c67204cfaa31ee52bb2acf56b.png][]

![31c8c471521845a585f3909017fd4ce9.png][]![6873b43efd7b44a0a9eb9790a9e88ad0.png][]

### 2.1编程语言与python ###

#### 2.2在 Welcome to Python.org 里面进入 ####

![f95bddab1a2b4eddbe3b0fba1181692e.png][]

![5da35e8e8f4f4c64be946a6688cecd8c.png][]

无脑下一步下载

下载后打开cmd，输入名令Python显示下载的版本号

exit（）退出编辑

![0a53711891254e3fa575a3d1133178aa.png][]

Pycharm无脑安装

![5eea4b2c2c00488cb86b756fd00098fd.png][]

![b1ccca75b3104645b18276f840daf5fe.png][]![4f63e2673da147d8b2ba39087278951c.png][]![88090b679c1b44549094e54370c8ca42.png][]![408f8e88353e48969862493da90351c0.png][]

社区版无需破解，专业版需破解，系列文章中有破解教程哦~

![1030f1f09d6a4f7c80a8bba8edd57fae.png][]

![2566270704fe42328767febe3562b819.png][] 配置解析器（本地已经下载的）

![a886fcc0381f4dd7a3223fb728f24e59.png][]

这样就可以啦~![66100d0224c84abf9386bb466bf6d40b.png][]

### 3.1创建第一个python程序helloworld ###

![fcbefe3ac022422baccf7c7b8c3db5ef.png][]

### 4.1注释 ###

> \# （做文字说明）快捷键为Ctrl＋/

### ![51cd1d2898934ea4ac9987f7001b3ebc.png][] 5.1变量和类型 ###

5.1.1变量

# 变量名 = 值
    a = 7
    b = 3
    c = 1
    print(a+b)
    print(a+c)
    print(b+c)

5.1.2类型

![3965e9b84a9a4efda7b62988a1cb2996.png][]

![0a50eef7623c4d18b9e5228e794b3af0.png][]

### 6.1标识符和关键字 ###

开发人员在开发工程中自定义的一些符号和名称

标识符是自定义的，如变量名称，函数名等

#### 6.1.2标识符的规则 ####

标识符由字母，下划线和数字组成，且数字不能开头

**python中的标识符区分大小写**

#### 6.1.3标识符的命名规则 ####

*  见名知意
 *  驼峰命名
 *  不用关键字命名

### 7.1输出 ###

#### 7.1.1常规输出 ####

print(type (a))

#### 7.1.2格式化输出 ####

age = 11
    print("我今年的年龄是%d岁"%age)

>     %d是占位符
> 
>     %是占位符的具体内容

#### 7.2常用格式符号 ####

![c51054ff118949139dd0b06f483d3369.png][]

age = 11
    name ="xiaoshuang"
    f = 98.22
    print("我是%s今年的年龄是%d岁，考了%f分"%(name,age,f))

>     print("我是%s今年的年龄是%d岁，考了%.1f分"%(name,age,f))
> 
> %.1f决定小数点后几位

![9054ead66f5e4723a4e12b759f422400.png][]

print("我是{}今年的年龄是{}岁，考了{}分".format(name,age,f))

#### 7.3换行输出 ####

> **/n**

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