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:mod:`builtins` --- Built-in objects
====================================

.. module:: builtins
   :synopsis: The module that provides the built-in namespace.

--------------

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
:func:`open`.  See :ref:`built-in-funcs` and :ref:`built-in-consts` for
documentation.


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.  For example, in a module
that wants to implement an :func:`open` function that wraps the built-in
:func:`open`, this module can be used directly::

   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.  The value of ``__builtins__`` is normally
either this module or the value of this module's :attr:`~object.__dict__` attribute.
Since this is an implementation detail, it may not be used by alternate
implementations of Python.

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