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本章中描述的各模块可帮你编写 Python 程序。例如，pydoc 模块接受一个模块并根据该模块的内容来生成文档。doctest 和 unittest 这两个模块包含了用于编写单元测试的框架，并可用于自动测试所编写的代码，验证预期的输出是否产生。2to3 程序能够将 Python 2.x 源代码翻译成有效的 Python 3.x 源代码。
本章中描述的模块列表是：
typing—- 类型提示支持pydoc—- 文档生成器和在线帮助系统- Python Development Mode
- Effects of the Python Development Mode
- ResourceWarning Example
- Bad file descriptor error example
doctest—- 测试交互性的Python示例unittest—- 单元测试框架unittest.mock—- mock对象库unittest.mock上手指南- 使用 mock
- Patch Decorators
- Further Examples
- Mocking chained calls
- Partial mocking
- Mocking a Generator Method
- Applying the same patch to every test method
- Mocking Unbound Methods
- Checking multiple calls with mock
- Coping with mutable arguments
- Nesting Patches
- Mocking a dictionary with MagicMock
- Mock subclasses and their attributes
- Mocking imports with patch.dict
- Tracking order of calls and less verbose call assertions
- More complex argument matching
- 2to3 - 自动将 Python 2 代码转为 Python 3 代码
test—- Python回归测试包test.support—- Utilities for the Python test suitetest.support.socket_helper—- Utilities for socket teststest.support.script_helper—- Utilities for the Python execution teststest.support.bytecode_helper—- Support tools for testing correct bytecode generation
