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GeezerVison is showing github.com — cmd.Cmd fails tab completion for lines beginning with `! ` (bang space) · Issue #133363 · python/cpython

cmd.Cmd fails tab completion for lines beginning with ! (bang space) #133363

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cmd.Cmd fails tab completion for lines beginning with ! (bang space)#133363
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type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

@godlygeek
godlygeek
opened on May 4, 2025
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Bug report

Bug description:

As noted in #133351 (comment) 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:

cpython/Lib/cmd.py

Lines 274 to 280 in 2bc8365

if begidx>0:
cmd, args, foo = self.parseline(line)
if cmd == '':
compfunc = self.completedefault
else:
try:
compfunc = getattr(self, 'complete_' + cmd)

which expects cmd to always be a string, but parsecmd is returning None instead when the line starts with ! and do_shell is not defined.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

  • gh-133363: Fix Cmd completion for lines beginning with !  #133364

Activity

  1. godlygeek
    added
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on May 4, 2025
  2. gaogaotiantian
    added a commit that references this issue on May 4, 2025

    gh-133363: Fix Cmd completion for lines beginning with `! ` (#133364)

    1d9406e
  3. gaogaotiantian
    closed this as completedon May 4, 2025
  4. diegorusso
    added a commit that references this issue on May 4, 2025

    Merge remote-tracking branch 'origin/main' into call-len

    c03babc
  5. Pranjal095
    added a commit that references this issue on Jul 12, 2025

    pythongh-133363: Fix Cmd completion for lines beginning with `! ` (py…

    1e2eb72
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    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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