max_files#

coffea.dataset_tools.max_files(fileset: DataGroupSpec, maxfiles: int | None = None) → DataGroupSpec[source]#

Modify the input fileset so that only the first “maxfiles” files of each dataset will be processed.

Parameters:

  • fileset (DataGroupSpec) – The set of datasets reduce to max-files files per dataset.

  • maxfiles (int or None, default None) – How many files to keep for each dataset.

Returns:

out – The reduced fileset with only the first maxfiles files left in.

Return type:

DataGroupSpec