This module provides direct access to all ‘built-in’ identifiers of Python; for
builtins.open is the full name for the built-in function
open(). See Built-in Functions and Built-in Constants for
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 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
available as part of their globals. The value of
__builtins__ is normally
either this module or the value of this module’s
Since this is an implementation detail, it may not be used by alternate
implementations of Python.