builtins — Built-in objects内置对象

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This module provides direct access to all ‘built-in’ identifiers of Python; for example, builtins.open is the full name for the built-in function open(). 该模块提供对Python所有“内置”标识符的直接访问；例如，builtins.open是内置函数open()的全名。See Built-in Functions and Built-in Constants for documentation.有关文档，请参阅内置函数和内置常量。

This module is not normally accessed explicitly by most applications, but can be useful in modules that provide objects with the same name as a built-in value, but in which the built-in of that name is also needed. 大多数应用程序通常不会显式访问此模块，但在提供与内置值同名的对象的模块中非常有用，但在这些模块中也需要内置该名称。For example, in a module that wants to implement an open() function that wraps the built-in open(), this module can be used directly:例如，在一个想要实现包装内置open()的open()函数的模块中，可以直接使用该模块：

import builtins
def open(path):
    f = builtins.open(path, 'r')
    return UpperCaser(f)

class UpperCaser:
    '''Wrapper around a file that converts output to upper-case.'''

    def __init__(self, f):
        self._f = f

    def read(self, count=-1):
        return self._f.read(count).upper()

    # ...

As an implementation detail, most modules have the name __builtins__ made available as part of their globals. 作为实现细节，大多数模块的名称__builtins__作为其全局变量的一部分提供。The value of __builtins__ is normally either this module or the value of this module’s __dict__ attribute. __builtins__的值通常是此模块或此模块的__dict__属性的值。Since this is an implementation detail, it may not be used by alternate implementations of Python.因为这是一个实现细节，所以Python的其他实现可能不会使用它。