New submission from Eric V. Smith <eric@trueblade.com>: https://github.com/python/cpython/blob/3.8/Lib/types.py The documentation says "If no callback is provided, it has the same effect as passing in lambda ns: ns." I read this as saying that the callback should return the namespace, but in reality the return value is ignored. I think the lambda should be "lambda ns: None". ---------- assignee: docs@python components: Documentation keywords: easy, newcomer friendly messages: 390854 nosy: docs@python, eric.smith priority: normal severity: normal status: open title: documentation for types.new_class() mention misleading default for exec_body versions: Python 3.10, Python 3.8, Python 3.9 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue43815> _______________________________________