python_doc_md/Intermediate/library/builtins.md

!builtins{.interpreted-text role="mod"} --- Built-in objects

::: {.module synopsis="The module that provides the built-in namespace."} builtins :::

---

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{.interpreted-text role="func"}.

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{.interpreted-text role="func"} function that wraps the built-in open{.interpreted-text role="func"}, 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 module's ~object.__dict__{.interpreted-text role="attr"} attribute. Since this is an implementation detail, it may not be used by alternate implementations of Python.

::: seealso

• built-in-consts{.interpreted-text role="ref"}
• bltin-exceptions{.interpreted-text role="ref"}
• built-in-funcs{.interpreted-text role="ref"}
• bltin-types{.interpreted-text role="ref"} :::