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authorGeorg Brandl <georg@python.org>2007-08-15 14:26:55 (GMT)
committerGeorg Brandl <georg@python.org>2007-08-15 14:26:55 (GMT)
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-\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 of
-Python; for example, \code{__builtin__.open} is the full name for the
-built-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 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
-\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 of
-their globals. The value of \code{__builtins__} is normally either
-this module or the value of this modules's \member{__dict__}
-attribute. Since this is an implementation detail, it may not be used
-by alternate implementations of Python.