builtins â Built-in objects¶
This module provides direct access to all âbuilt-inâ identifiers of Python; for example, builtins.open is the full name for the built-in function open().
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 builtins
def open(path):
f = builtins.open(path, 'r')
return UpperCaser(f)
class UpperCaser:
'''Wrapper around a file that converts output to uppercase.'''
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__ made available as part of their globals. The value of __builtins__ is normally either this module or the value of this moduleâs __dict__ attribute. Since this is an implementation detail, it may not be used by alternate implementations of Python.
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