Python 3.6.5 Documentation >  "builtins" — Built-in objects

"builtins" — Built-in objects
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This module provides direct access to all ‘built-in’ identifiers of
Python; for example, "builtins.open" is the full name for the built-in
function "open()". See Built-in Functions and Built-in Constants for
documentation.

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 "__builtins__"
made available as part of their globals. The value of "__builtins__"
is normally either this module or the value of this module’s
"__dict__" attribute. Since this is an implementation detail, it may
not be used by alternate implementations of Python.