Repository navigation
types.FunctionType is not included in builtin library #92316
Description
Hi, I'm trying to serialize & deserialize python types, and I hit the error when handling types.FunctionType.
To repro the error,
from types import FunctionType
FunctionType.module # builtin
FunctionType.qualname # function
import importlib
import sys
importlib.import_module(module_name)
module = sys.modules[module_name]
getattr(module, "function") # throw exception module 'builtins' has no attribute 'function'
I think it's because we didn't include FunctionType in builtin module, please educate me if I'm wrong.
Activity
MojoVampire commentedon May 5, 2022
Most of the types in
typesreport themselves this way (a minority claim to be part of thetypesmodule instead). That said, they shouldn't be in thebuiltinsmodule, because that would cause them all to be injected into the namespace of every script, and most of them are not nearly useful enough to justify cluttering every namespace with them. I suspect they claim to be frombuiltinsbecause they are, in fact, built-in types (instances of them get created implicitly when you define Python level functions), but they're largely C API constructs thattypesis exposing for the rare case they're needed.In short, no, they shouldn't be exposed the
builtinsmodule. Arguably, they should be changed to claim membership in thetypesmodule, but it's a little weird becausetypesis merely exposing them; they exist independent of thetypesmodule, they're just not very discoverable otherwise.serhiy-storchaka commentedon Jun 2, 2026
This is a duplicate of #100129 which has a PR.