引入模組
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The modules described in this chapter provide new ways to import other
Python modules and hooks for customizing the import process.

The full list of modules described in this chapter is:

* "zipimport" --- 從 Zip 封存檔案匯入模組

  * zipimporter 物件

  * 範例

* "pkgutil" --- 套件擴充工具程式

* "modulefinder" --- 搜尋腳本所使用的模組

  * "ModuleFinder" 的用法範例

* "runpy" --- 定位並執行 Python 模組

* "importlib" --- "import" 的實作

  * 簡介

  * 函式

  * "importlib.abc" -- Abstract base classes related to import

  * "importlib.machinery" -- Importers and path hooks

  * "importlib.util" -- Utility code for importers

  * 範例

    * Importing programmatically

    * Checking if a module can be imported

    * Importing a source file directly

    * Implementing lazy imports

    * Setting up an importer

    * Approximating "importlib.import_module()"

* "importlib.resources" -- Package resource reading, opening and
  access

  * Functional API

* "importlib.resources.abc" -- 資源的抽象基底類別

* "importlib.metadata" -- 存取套件的元資料

  * Overview

  * Functional API

    * Entry points

    * Distribution metadata

    * Distribution versions

    * Distribution files

    * Distribution requirements

    * Mapping import to distribution packages

  * Distributions

  * Distribution Discovery

  * Extending the search algorithm

* The initialization of the "sys.path" module search path

  * Virtual environments

  * _pth files

  * Embedded Python
