These attributes were added in Python 3.11, as part of PEP-657, and I believe they're intended to be public API. If so, adding them to the __init__ docstring would be nice!

(prompted by checking typeshed, which includes them, while reviewing https://peps.python.org/pep-0657/)

Linked PRs

• gh-128481: Add missing documentation for traceback.FrameSummary #128484
• [3.13] gh-128481: Improve documentation for traceback.FrameSummary (GH-128484) #130753
• [3.12] gh-128481: Improve documentation for traceback.FrameSummary (GH-128484) #130754
• gh-128481: indicate that the default value for FrameSummary.end_lineno changed in 3.13 #130755
• [3.13] gh-128481: indicate that the default value for FrameSummary.end_lineno changed in 3.13 (GH-130755) #130767