PyROOT loop over files, huge memory leak

ROOT
7

The subfolders also need the owner flag setting.

@Frederik_Wauters, can you add these lines to the end of your process_file function?

  histos_folder.SetOwner(True)
  for fo in histos_folder.GetListOfFolders():
    fo.SetOwner(True)
  histos_folder.Clear()

Cheers,
Enric