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Python Library Reference |  |
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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 open(). See chapter 2,
``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 open() function that wraps the built-in 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 __dict__
attribute. Since this is an implementation detail, it may not be used
by alternate implementations of Python.
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Python Library Reference | |
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