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Python自动化办公Day1:变量与字面量(零基础精讲笔记)

  • 2026-07-01 04:07:20
Python自动化办公Day1:变量与字面量(零基础精讲笔记)

开启Python自动化办公系统学习!很多新手入门报错、代码看不懂、逻辑理不清,根本原因都是基础概念不扎实

Day1 聚焦Python最核心的入门基石:变量、字面量、5大数据类型。本文整理成可直接套用、可直接复习的标准笔记,零基础小白零门槛看懂,完美适配入门学习与日常复盘。

一、核心概念:变量 & 字面量

这是所有Python代码的底层逻辑,记住一组通俗定义即可永久区分:

字面量:代码中真实、固定的数据本身,是程序要处理的原始数据。

变量:存储数据的容器盒子,可以随时赋值、修改、替换数据。

简单来说:字面量是内容,变量是装内容的盒子,写代码本质就是通过变量管理、处理各类字面量数据。

二、Python五大字面量类型(标准用法)

Python入门所有数据,只分为5类,覆盖自动化办公99%基础场景:

1. 数字类型(int / float)

用途:用于数值计算、统计、大小比对

整数 int:正整数、负整数、0(示例:10、-5、0)

浮点数 float:带小数点的数值(示例:3.14、2.5、-9.9)

2. 布尔类型(bool)

用途:代码逻辑判断、条件筛选、循环开关

仅两个标准值(首字母必须大写)

✅ True:条件成立、结果为真

✅ False:条件不成立、结果为假

3. 字符串类型(str)

用途:存储文字、符号、文本类数据

核心规则:所有文本必须用单引号/双引号包裹

重点避坑:带引号的数字(如"123")属于文本,无法直接数学运算,是新手高频报错点。

4. 空值(None)

用途:定义无数据、无返回、空内容的场景

关键区分:None是纯粹空值,不等于0、不等于空字符串、不等于False,常用于变量未赋值、函数无返回结果、接口空数据场景。

5. 数据容器

用途:批量存储多组、多条数据

✅ 列表 []:可增删改查、数据可重复,最灵活、使用频率最高

✅ 元组 ():数据固定不可修改,安全性更高

✅ 字典 {}:键值对格式,专门存储一一对应的数据

记忆口诀:单值单用,多值用容器;改数据用列表,固定用元组,对应数据用字典。

三、零基础标准书写规范(必背)

严格遵守以下格式,规避80%新手基础报错:

1. 数字:直接书写,无需任何符号包裹

2. 字符串:必须包裹单/双引号,引号前后统一

3. 布尔值:仅 True / False,首字母大写,无引号

4. 空值:统一书写 None,小写、引号包裹均为错误格式

5. 容器:列表[]、元组()、字典{},符号不可混用

四、学习总结

变量与字面量是Python的入门地基,所有自动化办公、数据处理、代码实操,都建立在数据类型的基础之上。

Day1 重点掌握:概念区分、5大数据类型、标准书写格式,打好基础才能高效进阶!

🎁 学习福利

需要本文配套数据类型对照表 + 入门练习题 + 标准源码,后台回复关键词【字面量】即可免费领取,边学边练快速巩固!

持续更新Python自动化办公打卡系列,零基础系统学办公,告别低效重复工作✨

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  1. CONNECT:[ UseTime:0.000576s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000881s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000288s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000283s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000200s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000610s ]
  8. SELECT * FROM `article` WHERE `id` = 502294 LIMIT 1 [ RunTime:0.000473s ]
  9. UPDATE `article` SET `lasttime` = 1783006344 WHERE `id` = 502294 [ RunTime:0.000864s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000225s ]
  11. SELECT * FROM `article` WHERE `id` < 502294 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006423s ]
  12. SELECT * FROM `article` WHERE `id` > 502294 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000390s ]
  13. SELECT * FROM `article` WHERE `id` < 502294 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000738s ]
  14. SELECT * FROM `article` WHERE `id` < 502294 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001546s ]
  15. SELECT * FROM `article` WHERE `id` < 502294 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.010940s ]
0.092334s