模块"builtin"的"__import__"属性的默认绑定是什么? [英] What is the default binding to the `__import__` attribute of the module `builtin`?

问题描述

从Python入手

自定义进口商

Python提供的一项高级，很少需要的功能是 更改某些或所有导入和从中的语义的能力 声明.

An advanced, rarely needed functionality that Python offers is the ability to change the semantics of some or all import and from statements.

重新绑定__import __

您可以重新绑定模块builtin的__import__属性 到您自己的自定义导入程序功能-例如，使用 内建的「Python内建程式」中显示的一般内建封装技术 第174页.

You can rebind the __import__ attribute of the module builtin to your own custom importer function—for example, one using the generic built-in-wrapping technique shown in "Python built-ins" on page 174.

1. 在您可以重新绑定模块builtin的__import__属性"中，模块builtin"应该改为模块builtins"吗?

1. In "You can rebind the __import__ attribute of the module builtin", should "the module builtin" be "the module builtins" instead?

是模块builtin的__import__属性"" __import__属性的默认实现?

Is "the __import__ attribute of the module builtin" bound to importlib.__import__function by default? Or does "the module builtin" provide the default implementation bound to its __import__ attribute?

推荐答案

1. 是的，这是本书中的错字.在Python 2中，相同的模块命名为 __builtin__ (否s )，在Python 3中被命名为 builtins .

1. Yes, that's a typo in the book. In Python 2 the same module is named __builtin__ (no s), in Python 3 it is named builtins.

builtins.__import__是与importlib.__import__不同的功能.如果要重新绑定builtins.__import__，请保存参考.

builtins.__import__ is a distinct function from importlib.__import__. If you are going to rebind builtins.__import__, save a reference.

• builtins.__import__是在C 中实现，并且实际上调用 C- API PyImport_ImportModuleLevelObject函数.

• builtins.__import__ is implemented in C, and essentially calls the C-API PyImport_ImportModuleLevelObject function.

importlib.__import__是

importlib.__import__ is a pure-Python function. The goal of importlib is to provide a pure-python implementation of the import machinery so it can be hacked on more easily, and this function is no exception.

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