Function union

deps/v8/PRESUBMIT.py:201–203

Ensure no duplicates

(list_of_lists)

    return os.path.isfile(p) and os.path.basename(p) == 'DEPS'

  def union(list_of_lists):
    """Ensure no duplicates"""
    return set(sum(list_of_lists, []))

  def _CollectImpactedFiles(deps_file):
    # TODO(liviurau): Do not walk paths twice. Then we have no duplicates.