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零基础也能学 Python!第一个程序 + 变量初体验��

  • 2026-03-25 00:06:20
零基础也能学 Python!第一个程序 + 变量初体验��
Python零基础第1章:环境配置 + 第一个程序 + 变量

一、为什么学 Python?

你是否想过,为什么大家都在学 Python?

Python 是一门 简单又强大的编程语言,像一个万能工具箱:

  • 📊 数据分析:快速统计、画图,看懂数据

  • 🤖 人工智能 / 机器学习:让电脑像你一样“思考”

  • 🌐 Web 开发:搭建网站、写后台

  • ⚡ 自动化办公:批量处理文件、发邮件,节省大量时间

一句话总结:Python 能帮你做很多“重复劳动”或高大上的事,而入门几乎零门槛


二、环境配置(快速上手版)

1️⃣ 安装 Python

  1. 访问官网:https://www.python.org/downloads/

  2. 下载最新稳定版 Python 3.x

  3. 安装时勾选 “Add Python to PATH”

  4. 安装完成后,在终端(Windows CMD / Mac Terminal)输入:

python --version

显示版本号,说明安装成功 ✅


2️⃣ 安装编辑器(推荐 VS Code 或 PyCharm)

VS Code

  • 下载:https://code.visualstudio.com/

  • 安装 Python 扩展

  • 新建 hello.py 文件,输入:

print("Hello, Python!")

  • 右键 → 运行 Python 文件

PyCharm(Community 免费版)

  • 下载:https://www.jetbrains.com/pycharm/

  • 创建新项目 → 新建 Python 文件 → 输入代码 → 运行

💡 小Tip:如果不想安装,可以用 Google Colab / Replit 在线运行 Python,免安装直接上手。


三、第一个 Python 程序

打开编辑器,输入:

print("Hello, Python!")

运行后,你会看到:

Hello, Python!

🎉 你已经写出了第一个 Python 程序!试着把 "Hello, Python!" 改成你的名字或心情,看看屏幕会发生什么。


四、变量初体验

1️⃣ 什么是变量?

变量就像一个“标签”,用来存储信息,方便随时调用。生活中的例子:你的笔记本、手机、心情日记……


2️⃣ 变量命名规则

  • 只能包含字母、数字、下划线 _

  • 不能以数字开头

  • 不能使用 Python 保留字(如 ifforprint

  • 尽量有意义,例如:nameageheight


3️⃣ 示例代码

# 定义变量name = "Alice"age = 20height = 1.65is_student = True# 使用变量print("姓名:", name)print("年龄:", age)print("身高:", height)print("是否学生:", is_student)

输出:

姓名: Alice年龄: 20身高: 1.65是否学生: True


4️⃣ 变量概念流程图

[变量名] -----> [存储值] -----> [使用 / 输出]  name           "Alice"           print(name)  age            20print(age)


五、小练习

  1. 定义两个变量 my_name 和 my_hobby,打印输出

  2. 给变量重新赋值,再打印看看变化

  3. 小挑战:定义一个变量存储今天的心情,输出到屏幕

💡 小Tip:变量名尽量有意义,看代码就知道是什么内容。


六、总结

  • Python 安装完成 → 可以运行程序

  • 你写了第一个程序,屏幕上显示了输出

  • 你学会了变量及命名规则,能够存储和使用数据

下一章我们将学习 更多数据类型 + 运算符,让程序更聪明、更有趣!

附录:
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  1. CONNECT:[ UseTime:0.000432s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000521s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000279s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000188s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000551s ]
  8. SELECT * FROM `article` WHERE `id` = 481005 LIMIT 1 [ RunTime:0.000906s ]
  9. UPDATE `article` SET `lasttime` = 1774576446 WHERE `id` = 481005 [ RunTime:0.008467s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000244s ]
  11. SELECT * FROM `article` WHERE `id` < 481005 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000519s ]
  12. SELECT * FROM `article` WHERE `id` > 481005 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000382s ]
  13. SELECT * FROM `article` WHERE `id` < 481005 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000628s ]
  14. SELECT * FROM `article` WHERE `id` < 481005 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006715s ]
  15. SELECT * FROM `article` WHERE `id` < 481005 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001013s ]
0.091043s