SelectionTemplate (Python)

The SelectionTemplate Cython class wraps the C++ selection_template. User selection classes must subclass it and override selection (and optionally strategy, Postprocessing, merge).

Special Methods

Signature	Description
`__hash__() → int`	Hash derived from the event hash string.
`dump(path, name) / load(path, name)`	Pickle-serialise or restore the selection object.
`HashToWeightFile(hash_) → list[dict[str, float]]`	Return the per-variable weight maps for the given event hash.
`InterpretROOT(path: str, tree: str)`	Re-run over a saved selection ROOT output file to populate `root_leaves` for post-processing.
`Postprocessing()`	Hook called after all events are processed. Override to produce plots or derived quantities.

Properties

Property	Type	Description
`PassedWeights`	`dict[str, dict[str, float]]`	Map of passed event hashes to their per-variable weight maps.
`GetMetaData`	`dict[str, Meta]`	Dictionary of `Meta` objects keyed by dataset label.

C++ Interface

Method / field	Description
`selection(ev: EventTemplate) → bool`	Override: return `True` to accept the event.
`strategy(ev: EventTemplate)`	Override: additional processing for accepted events.
`merge(other: SelectionTemplate)`	Override: merge parallel results into `self`.
`write(name, particle_list)`	Serialise a list of particle attributes to the output ROOT tree.