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Python开发从零开始-4-基础语法(标识符和关键字)

  • 2026-06-26 11:14:32
Python开发从零开始-4-基础语法(标识符和关键字)
本文小编和大家分享Python基础语法中的标识符和关键字相关知识,并介绍初学阶段使用的IDE。
一、标识符
Python标识符是用于标识实体的符号序列。说白了,标识符就是给程序实体(变量、常量、函数、类、模块等)起的名字,之后便可通过标识符来使用程序实体。当然标识符命名有明确的要求,正如咱们起名一样,要遵从一定的规范。
合规的Python标识符应遵从如下规定】:
  • 标识符由大写字母(A-Z)、小写字母 (a-z)、数字(0-9)、下划线(_)组成,Python3开始支持ASCII之外的Unicode 字符(比如:中文字符);

  • 标识符第一个字符不能是数字(0-9);

  • 标识符区分大小写,age和Age是不同的标识符;

  • 标识符必须至少包含一个字符,但没有长度上限;

  • 不得使用保留关键字(关键字是预留单词,例如:if、for等)。

合规Python标识符示例:
错误Python标识符示例:
Python标识符命名建议】:
  • 标识符名称含义能体现其用途,例如:age表示年龄;
  • 避免使用容易混淆的字符,例如:大写i与小写l;
  • 命名风格应在项目编码中保持一致。
二、关键字
关键字(Keywords),也称保留字,是指那些已经被Python语言赋予了特定意义的单词,用户不能使用它们作为自定义标识符。

随着Python语言的不断发展,不同Python版本的关键字可能会有变化。Python标准库(Python编程环境的核心组成部分)提供了一个keyword模块,可以输出当前版本的所有关键字。

1、新建“listKeyword.py”文件,并输入如下代码:

import keyword

print(keyword.kwlist)

2、在“keyword.py同目录下“在终端中打开”,终端中输入如下代码:

python keyword.py

回车运行,终端会输出当前版本所有关键字。

三、初学阶段使用的IDE

随着学习深入,大家可能会觉得使用记事本,然后在终端中运行非常麻烦,效率很低。前文Python开发从零开始-2-集成开发环境与首行代码中曾介绍多种IDE,小编推荐使用Thonny作为初学阶段使用的IDE,Thonny安装包内置Python解释器,所以用户安装后可以直接使用而不用考虑开发环境配置。下面简单介绍工具的使用。

1、下载Thonny(建议下载免安装版)

下载地址:

https://github.com/thonny/thonny/releases/tag/v5.0.0

为方便大家下载,小编将工具上传网盘,网盘地址:

https://pan.quark.cn/s/8d054043650f

2、解压文件,双击“thonny.exe”运行工具,工具首次打开可选择界面语言

3、设置语言后,进入主界面,默认开启代码编辑区和交互式命令行(Shell)。点击“工具”菜单,点击“选项”,在“Thonny选项”对话框中,选择“编辑器”选项卡,选中“输入时提示自动完成”。

点击“确定”关闭对话框,后续编码时,将开启自动完成功能,可以极大提升编码效率。

Thonny虽然小巧,但功能十分强大,语法高亮、变量查看、调试和包管理等等,完全能够满足初学者使用需求。

【小编提示】后续Python基础学习过程中,将采用Thonny编写和测试代码,随着学习深入,再根据需要使用更为高级的IDE。

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  1. CONNECT:[ UseTime:0.000650s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000936s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000329s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000261s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000498s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000516s ]
  8. SELECT * FROM `article` WHERE `id` = 490493 LIMIT 1 [ RunTime:0.000401s ]
  9. UPDATE `article` SET `lasttime` = 1783099677 WHERE `id` = 490493 [ RunTime:0.006820s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000238s ]
  11. SELECT * FROM `article` WHERE `id` < 490493 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000446s ]
  12. SELECT * FROM `article` WHERE `id` > 490493 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000362s ]
  13. SELECT * FROM `article` WHERE `id` < 490493 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000811s ]
  14. SELECT * FROM `article` WHERE `id` < 490493 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000675s ]
  15. SELECT * FROM `article` WHERE `id` < 490493 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003891s ]
0.087900s