[issue28528] Pdb.checkline() attribute error when 'curframe' is None

[Erlend E. Aasland]

Erlend E. Aasland <erlend.aasland at innova.no> added the comment:

Yes, test.os_helper was introduced in 3.10. I've manually cherry-picked 8563a7052ccd98e6a381d361664ce567afd5eb6e to 3.9 (GH-26053).

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<https://bugs.python.org/issue28528>
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