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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"cmd.Cmd fails tab completion for lines beginning with `! ` (bang space)","articleBody":"# Bug report\n\n### Bug description:\n\nAs noted in https://github.com/python/cpython/issues/133351#issuecomment-2848895066 PDB allows commands that start with `!`, but Cmd fails to tab complete them if there's a space after the `!`, because it falls down this code path:\n\nhttps://github.com/python/cpython/blob/2bc836523105a2197a1f987cc03911bece74b35e/Lib/cmd.py#L274-L280\n\nwhich expects `cmd` to always be a string, but `parsecmd` is returning `None` instead when the line starts with `!` and `do_shell` is not defined.\n\n### CPython versions tested on:\n\nCPython main branch\n\n### Operating systems tested on:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-133364\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/godlygeek","@type":"Person","name":"godlygeek"},"datePublished":"2025-05-04T01:51:24.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/133363/cpython/issues/133363"}