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1 分钟读懂:Python模块化

  • 2026-01-04 13:18:33
1 分钟读懂:Python模块化
202512311240509041

每天1分钟,轻松懂 Python

这是一份有基础、有深度的 Python 核心技术手册

拆分与组织代码

当我们写一个较大的应用程序时,如果都把所有代码都放在几个 py 文件中。有不也多久,这些 py 文件就会变得过于臃肿。

这时,我们就需要考虑将 Python 进行模块化。简单来说,模块化就是对 Python 代码的拆分与重组。

1、简单模块化

文件结构:

Project/  ├── utils.py  └── main.py  

utils.py 文件,定义函数

defget_sum(a, b):return a + b  classEncoder:defencode(self, s):return s[::-1

main.py 文件,调用函数

from utils import get_sum, Encoder  print(get_sum(35))  # 8  encoder = Encoder()  print(encoder.encode('abc'))  # 'cba'  
2、子文件夹与包

慢慢地,你会发现,把所有文件都堆在一个文件夹下也并不是办法。所以,就有了 “包”

当子文件夹中,创建 __init__.py 文件标记,它就变成了 “包”。

那么,我们来对项目做进一步优化:

文件结构

Project/  ├── utils/  │   ├── __init__.py  │   ├── str_utils.py  │   └── class_utils.py  └── main.py  

utils/str_utils.py,定义函数

defget_sum(a, b):return a + b

utils/class_utils.py,定义函数

classEncoder(object):defencode(self, s):return s[::-1]classDecoder(object):defdecode(self, s):return''.join(reversed(list(s)))

main.py 文件,调用函数

from utils.str_utils import get_sum  from utils.class_utils import Encoder  # do something ...

路径与规范

绝对路径:是从项目根目录开始(如 Project/utils/str_utils.py )。

相对路径:依赖文件层级(复杂情况下,不推荐使用相对路径 )。

if __name__ == '__main__'

脚本作为主程序执行时运行代码,被 import 时不执行。

# utils/str_utils.py  defget_sum(a, b):return a + b  if __name__ == '__main__':  # 主程序执行时运行(如 `python str_utils.py`)      print(get_sum(12))  # 3  

关于 if __name__ == '__main__' 更多内容,可以参考下面这篇文章中的 “明确代码入口” 部分:

点击跳转:从脚本到工具:文件批量重命名实战

模块化的工程价值

1、优势
  1. 代码复用:函数 / 类跨文件调用,减少重复逻辑。
  2. 可维护性:功能拆分后,修改局部不影响全局。
  3. 协作开发:多人分工维护不同模块(如 Facebook 单代码库模式 )。
2、大型项目实践
  1. 统一代码库(如 Facebook、Google ):所有模块从根目录导入,避免版本冲突。
  2. 虚拟环境(VirtualEnv):隔离项目依赖,通过 activate 脚本配置环境变量。

-------- 写在最后 --------

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  1. CONNECT:[ UseTime:0.001270s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001737s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000736s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000675s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001727s ]
  6. SELECT * FROM `set` [ RunTime:0.000606s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001758s ]
  8. SELECT * FROM `article` WHERE `id` = 459424 LIMIT 1 [ RunTime:0.005652s ]
  9. UPDATE `article` SET `lasttime` = 1770604885 WHERE `id` = 459424 [ RunTime:0.007056s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.005454s ]
  11. SELECT * FROM `article` WHERE `id` < 459424 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002475s ]
  12. SELECT * FROM `article` WHERE `id` > 459424 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.020019s ]
  13. SELECT * FROM `article` WHERE `id` < 459424 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.103189s ]
  14. SELECT * FROM `article` WHERE `id` < 459424 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.063750s ]
  15. SELECT * FROM `article` WHERE `id` < 459424 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.146893s ]
0.524808s