Bug report

Bug description:

Python 3.12 introduced $-prefixed convenience variables to pdb (#103693).

It automatically replaces $-words in strings, which is undocumented. @nedbat suggests this is unintended behavior.

(Pdb) p '$in'
'__pdb_convenience_variables["in"]'

This totally breaks MongoDB queries inside pdb, as it makes frequent use of such strings.

CPython versions tested on:

3.12

Operating systems tested on:

Linux

Linked PRs

• gh-112343: pdb: Use tokenize to replace convenience variables #112380
• [3.12] gh-112343: pdb: Use tokenize to replace convenience variables (GH-112380) #114202