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Python入门学习笔记:基础语法与环境配置

  • 2026-01-29 19:41:41
Python入门学习笔记:基础语法与环境配置
Python入门核心知识点
🌟 Python基础认知
Python概况：1989年开发，2022年全球编程语言排行榜第一，主打简洁高效。              核心优势：
语法简洁：相同功能代码量为C语言的1/100，Java的1/10
开发效率高：10分钟完成的功能，C语言需要2小时
应用广泛：AI、数据分析、后端开发等领域首选语言
💻 编程语言工作原理
基本概念：计算机只认识二进制(0和1)，人类语言无法直接翻译。Python作为桥梁，通过严格语法将人类意图转换为计算机可执行的指令。        
执行流程：人类编写Python代码 → 解释器翻译成二进制 → 计算机执行并返回结果。
⚙️ 环境配置要点
安装关键：1. 必须勾选"Add Python to PATH"。2. 建议安装路径：D:\dev\python。3. 验证成功：cmd输入python显示版本号和>>>。       
两种执行方式：交互式：输入python进入，逐行执行，适合学习测试。文件执行：创建.py文件，python文件路径执行，适合完整程序。
🚀 PyCharm核心配置
工程创建：新建工程 → 纯净Python模板 → 配置解释器（找到python.exe）
必备快捷键： Ctrl+Shift+F10：运行当前文件； Ctrl+D：复制当前行；Ctrl+F：全局搜索；Shift+F6：文件重命名。
📝 基础语法精要
字面量类型：
类型
语法
示例
字符串
双引号包围
"hello"
整数
直接书写
666、-88
浮点数
直接书写
13.14、-5.21
print()函数：
print("Hello World")  # 输出字符串print(666)            # 输出整数print(52.31)          # 输出浮点数 
注释语法：
单行注释：
# 注释内容（#后加空格）
多行注释：
"""多行注释内容"""
注释原则：解释"为什么做"，而非"做了什么"，避免过度注释。
🎯 Hello World程序
标准结构：print("Hello World!")`      
常见错误：环境变量未配置 → 重装时勾选"Add Python to PATH"；使用中文符号 → 全部改为英文半角符号-；未进入解释器环境 → 先输入python进入交互模式
📚 今日学习总结
核心掌握：1. Python语言背景和优势 2. 编程语言工作原理 3. 环境安装和配置 4.字面量和print()函数 5. 注释语法和应用 6. PyCharm基本操作。       
技术要点：计算机只认识二进制；解释器负责翻译和执行；代码必须严格遵循语法规则；注释提升代码可读性和维护性。       
通过今天学习，已具备Python开发的基础能力，为后续AI学习奠定基础。
本文来自网友投稿或网络内容，如有侵犯您的权益请联系我们删除，联系邮箱：wyl860211@qq.com 。

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  1. CONNECT:[ UseTime:0.000725s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000769s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.007088s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004775s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000913s ]
  6. SELECT * FROM `set` [ RunTime:0.029363s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001725s ]
  8. SELECT * FROM `article` WHERE `id` = 463115 LIMIT 1 [ RunTime:0.065976s ]
  9. UPDATE `article` SET `lasttime` = 1770555019 WHERE `id` = 463115 [ RunTime:0.040549s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.003303s ]
  11. SELECT * FROM `article` WHERE `id` < 463115 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.026612s ]
  12. SELECT * FROM `article` WHERE `id` > 463115 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000578s ]
  13. SELECT * FROM `article` WHERE `id` < 463115 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004935s ]
  14. SELECT * FROM `article` WHERE `id` < 463115 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001063s ]
  15. SELECT * FROM `article` WHERE `id` < 463115 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.032826s ]
0.371232s