Docstring of traceback.format_exception_only misses the __notes__ part

[sobolevn]

Bug report

Compare the docs:

cpython/Doc/library/traceback.rst

Lines 138 to 146 in 7237fb5

	.. function:: format_exception_only(exc, /[, value])
	Format the exception part of a traceback using an exception value such as
	given by ``sys.last_value``. The return value is a list of strings, each
	ending in a newline. The list contains the exception's message, which is
	normally a single string; however, for :exc:`SyntaxError` exceptions, it
	contains several lines that (when printed) display detailed information
	about where the syntax error occurred. Following the message, the list
	contains the exception's :attr:`notes <BaseException.__notes__>`.

With the docstring:

cpython/Lib/traceback.py

Lines 151 to 165 in 7237fb5

	def format_exception_only(exc, /, value=_sentinel):
	"""Format the exception part of a traceback.
	The return value is a list of strings, each ending in a newline.
	Normally, the list contains a single string; however, for
	SyntaxError exceptions, it contains several lines that (when
	printed) display detailed information about where the syntax
	error occurred.
	The message indicating which exception occurred is always the last
	string in the list.
	"""
	if value is _sentinel:

Docstring is missing

Following the message, the list contains the exception's :attr:`notes <BaseException.__notes__>`. 

part.

I think that it would be better to mention __notes__ there as well.
PR is incoming.

Linked PRs

• gh-111157: Mention __notes__ in traceback.format_exception_only docstring #111158
• [3.12] gh-111157: Mention __notes__ in traceback.format_exception_only docstring (GH-111158) #111163
• [3.11] gh-111157: Mention __notes__ in traceback.format_exception_only docstring (GH-111158) #111164