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+
+:mod:`__builtin__` --- Built-in objects
+=======================================
+
+.. module:: __builtin__
+   :synopsis: The module that provides the built-in namespace.
+
+
+This module provides direct access to all 'built-in' identifiers of Python; for
+example, ``__builtin__.open`` is the full name for the built-in function
+:func:`open`.  See chapter :ref:`builtin`.
+
+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 __builtin__
+
+   def open(path):
+       f = __builtin__.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__`` (note
+the ``'s'``) made available as part of their globals.  The value of
+``__builtins__`` is normally either this module or the value of this modules's
+:attr:`__dict__` attribute.  Since this is an implementation detail, it may not
+be used by alternate implementations of Python.
+