\section{\module{__builtin__} ---         Built-in objects} \declaremodule[builtin]{builtin}{__builtin__}\modulesynopsis{The module that provides the built-in namespace.}  This module provides direct access to all `built-in' identifiers ofPython; for example, \code{__builtin__.open} is the full name for thebuilt-in function \function{open()}.  See chapter~\ref{builtin},``Built-in Objects.'' This module is not normally accessed explicitly by most applications,but can be useful in modules that provide objects with the same nameas a built-in value, but in which the built-in of that name is alsoneeded.  For example, in a module that wants to implement an\function{open()} function that wraps the built-in \function{open()},this module can be used directly: \begin{verbatim}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()     # ...\end{verbatim} As an implementation detail, most modules have the name\code{__builtins__} (note the \character{s}) made available as part oftheir globals.  The value of \code{__builtins__} is normally eitherthis module or the value of this modules's \member{__dict__}attribute.  Since this is an implementation detail, it may not be usedby alternate implementations of Python.