Escape octothorpe characters in matplotlibrc #19289
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PR Summary
Fixes #19288
When parsing matplotlibrc files, the octothorpe (
#) indicates a comment. Escaping with\#now allows the parameter value itself to contain#. For example,results in
rcParams["text.latex.preamble"] == "\\newcommand{\\foo}[1]{\\bar{#1}}"as desired.PR Checklist
pytestpasses).flake8on changed files to check).flake8-docstringsand runflake8 --docstring-convention=all).doc/users/next_whats_new/(follow instructions in README.rst there).doc/api/next_api_changes/(follow instructions in README.rst there).