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Enhancing PyCool with ROOT6: Interactivity, Dictionary Management, and Class Loading

This document outlines the evolution of PyCool's integration with ROOT6, focusing on enhancing interactivity through Python and efficient dictionary management. It discusses how to utilize an extensive selection of XML classes, auto-loading into Python via rootmap, and the implications of using the "interpreteronly" flag to streamline the interface. Key points include strategies to manage selection.xml, resolve integration issues, and the distinction between PyCool implementations for ROOT5 and ROOT6. A summary of pending issues related to ROOT6 for PyCool is also provided.

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Enhancing PyCool with ROOT6: Interactivity, Dictionary Management, and Class Loading

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  1. PyCool evolution (interactivity, dictionary, rootmap) • Very old (as still done in ROOT5): • Create .so with both interactive (python) and dictionary (I/O) information • Very large selection.xml: many classes included in dictionary and rootmap • Autoload .so into python using one of the classes in rootmap • Current ROOT6 strategy (see 2013 Nov 27 meeting) • Use “interpreteronly” flag to remove dictionary (I/O) information from .so • The .so only includes interactive (python) information – the headers for JIT • Keep very large selection.xml: many classes included in rootmap • Misunderstanding – I thought selection.xml was ignored because of “interpreteronly” • Autoload .so into python using one of the classes in rootmap • New ROOT6 strategy (still to be implemented in PyCool): • Manually load .so into python – rootmap is no longer needed • Use an empty selection.xml – no need to include any classes in rootmap • OK also in the long term – selection.xml will be irrelevant to pcm creation • Keep “interpreteronly” – even if empty selection file makes this ~irrelevant • Different PyCool implementations for ROOT5 and ROOT6 • This is something we already considered (and ~worked on) before using “interpreteronly”

  2. Summary of ROOT6 pending issues in PyCool • Blocker: class _global_cpp has no attribute 'cool‘ (ROOT-5965) • High: use empty PyCool selection.xml (bug #103298) – to be fixed in COOL • High: c++ exception propagation to Python (ROOT-5603) • Medium: undefined std::transform (ROOT-5869 aka ROOT-5838) – fixed? • Medium: avoid deprecation warning (ROOT-5870) – to be fixed in COOL • Low: wrong return code from failed ProcessLine (ROOT-5698) • Low: Tok assertions if LLVMDEV is enabled (ROOT-5697)

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