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5小时速通Python:模块导入,这一篇就够了

  • 2026-06-29 01:58:00
5小时速通Python:模块导入,这一篇就够了

你是否遇到过这样的场景:

  • 写了一个很实用的函数,下次写新代码时又得复制粘贴一遍?

  • 代码越来越长,几千行挤在一个文件里,改一个地方头疼半天?

  • 看到别人代码里 import xxx 然后就能用各种现成的功能,自己却不知道怎么写?

  • 今天我们就用最直白的方式,把Python模块导入这件事彻底讲清楚。学会它,你的编程效率至少翻一倍。

一、什么是模块?为什么需要模块?

  • 模块就是一个 .py 文件,里面装着变量、函数、类。

  • 比如你写了一个 tools.py,里面定义了一个加法函数

tools.py就是一个模块。别的程序可以用一句话把它的功能拿过去

模块的好处

  • 把不同功能的代码拆开,一个文件只做一件事,方便维护。

  • 写好的功能可以反复使用,不用重复写代码。

  • 可以调用别人写好的强大模块(比如 ossysrequests)站在巨人的肩膀上。

    二、三种最常用的导入方式

具体例子

方式一:import math

三、新手最容易踩的坑

ModuleNotFoundError: No module named 'xxx'

原因:你要导入的模块没有安装(如果是第三方库),或者模块名字写错了。

解决

  • 对于标准库(如 ossysmath)不需要安装,直接 import

  • 对于第三方库(如 requestsnumpypandas),需要先用 pip install 库名 安装。

    四、实战:自己写一个模块并用起来

    第1步:新建一个文件,叫 my_math.py,写入:

    第2步:在同一个文件夹下新建一个文件,叫 main.py,写入:

    第3步:运行 main.py,就能看到结果。

    📁 注意:

    my_math.py 和 main.py 必须在同一个文件夹里,否则Python找不到模块。

    如果你的模块在其他文件夹,可以用 sys.path 添加路径

最后

  Python 的模块系统,说白了就是帮你把代码整理得更清楚、还能重复用。学会了它,你就不再是只会写单文件脚本的新手,而是能搭出正经项目的准工程师。

  今天讲的三种导入方式:import xxxfrom xxx import yyy、以及 as 起别名,够你应付未来两年里 95% 的编码场景。先把 import math 玩熟,再试着写一个自己的小工具模块。

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  139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
  140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000744s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000845s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001398s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003684s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000889s ]
  6. SELECT * FROM `set` [ RunTime:0.001329s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000810s ]
  8. SELECT * FROM `article` WHERE `id` = 487869 LIMIT 1 [ RunTime:0.009377s ]
  9. UPDATE `article` SET `lasttime` = 1783139369 WHERE `id` = 487869 [ RunTime:0.004691s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000394s ]
  11. SELECT * FROM `article` WHERE `id` < 487869 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.004582s ]
  12. SELECT * FROM `article` WHERE `id` > 487869 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.007147s ]
  13. SELECT * FROM `article` WHERE `id` < 487869 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.019052s ]
  14. SELECT * FROM `article` WHERE `id` < 487869 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.022642s ]
  15. SELECT * FROM `article` WHERE `id` < 487869 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.033830s ]
0.224870s