Variables can now be computed by an embedded Python3 interpreter in addition
to the Boost.Spirit X3 expression engine. A <python> ... </python> block
receives all collection parameters as per-run lists (bare names, plus
par[]/parErr[] dictionaries as a fallback for names that are not valid Python
identifiers such as 'lambda') and must assign <name> and <name>Err; errors are
user supplied. Works both in the GUI variable dialog and in scripts.
The feature is optional and only enabled when ROOT is built with TPython
(CMake target ROOT::ROOTTPython); otherwise it compiles out. See MUPP_PY.README
for ROOT configure requirements and usage.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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