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Python buffers support comint-delete-output, but if I forget to do it before entering another command, I have a big hunk of text I can't easily erase.

In shell mode, I can set the mark and run comint-previous-prompt, and then erase the region. But in Python buffers, it tells me that the text is read only. I can run read-only-mode, to attempt to turn it off, but it doesn't work.

If I try to kill the lines manually, it mostly works (but is too tedious), but one out of every 50 lines or so will be read-only and I can't kill it.

If I try something like M-1 0 0 C-k, it invariably tells me the text is read-only, and won't kill any of it.

Running GNU Emacs 29.1 (build 1, aarch64-apple-darwin21.6.0, NS appkit-2113.60 Version 12.6.6 (Build 21G646)) of 2023-08-16

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You should be able to use comint-clear-buffer ("C-c M-o") to remove everything. There is also comint-kill-region that should properly deal with the read-only prompts, at least according to its documentation.

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