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pdb unintentionally interpolates strings with convenience variables #112343

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@salty-horse

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@salty-horse

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

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stdlibPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or error

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