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45 lines
1.5 KiB
45 lines
1.5 KiB
4 months ago
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:mod:`__builtin__` --- Built-in objects
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=======================================
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.. module:: __builtin__
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:synopsis: The module that provides the built-in namespace.
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This module provides direct access to all 'built-in' identifiers of Python; for
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example, ``__builtin__.open`` is the full name for the built-in function
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:func:`open`. See :ref:`built-in-funcs` and :ref:`built-in-consts` for
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documentation.
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This module is not normally accessed explicitly by most applications, but can be
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useful in modules that provide objects with the same name as a built-in value,
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but in which the built-in of that name is also needed. For example, in a module
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that wants to implement an :func:`open` function that wraps the built-in
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:func:`open`, this module can be used directly::
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import __builtin__
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def open(path):
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f = __builtin__.open(path, 'r')
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return UpperCaser(f)
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class UpperCaser:
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'''Wrapper around a file that converts output to upper-case.'''
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def __init__(self, f):
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self._f = f
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def read(self, count=-1):
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return self._f.read(count).upper()
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# ...
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.. impl-detail::
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Most modules have the name ``__builtins__`` (note the ``'s'``) made available
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as part of their globals. The value of ``__builtins__`` is normally either
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this module or the value of this modules's :attr:`~object.__dict__` attribute. Since
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this is an implementation detail, it may not be used by alternate
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implementations of Python.
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