Fix pyparsing deprecation flood without touching matplotlib - #748
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Reverts the matplotlib >= 3.11 requirement: hosted notebook runtimes (Colab) preimport matplotlib at kernel start, so a mid-session pip upgrade leaves a broken half-old, half-new install (new mpl_toolkits.axes_grid1 loaded lazily against the old in-memory matplotlib._api). Instead, rebind pyparsing's deprecated camelCase compatibility aliases (parseString / resetCache, including the parseAll argument) to call the snake_case API directly with the renamed arguments. matplotlib < 3.11 mathtext calls those aliases once per rendered math label, which floods plotting output under pyparsing >= 3.3; with the rebind the deprecated code paths are never executed, in any session, with no install changes. Verified the rebound aliases give identical parse results and exceptions, emit no warnings, and are skipped on matplotlib >= 3.11. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
smribet
approved these changes
Aug 1, 2026
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Reverts the matplotlib >= 3.11 requirement: hosted notebook runtimes
(Colab) preimport matplotlib at kernel start, so a mid-session pip
upgrade leaves a broken half-old, half-new install (new
mpl_toolkits.axes_grid1 loaded lazily against the old in-memory
matplotlib._api).
Instead, rebind pyparsing's deprecated camelCase compatibility aliases
(parseString / resetCache, including the parseAll argument) to call the
snake_case API directly with the renamed arguments. matplotlib < 3.11
mathtext calls those aliases once per rendered math label, which floods
plotting output under pyparsing >= 3.3; with the rebind the deprecated
code paths are never executed, in any session, with no install changes.
Verified the rebound aliases give identical parse results and
exceptions, emit no warnings, and are skipped on matplotlib >= 3.11.
Co-Authored-By: Claude Fable 5 noreply@anthropic.com