def METHOD_NAME(self):
    p = pyopenms.FileHandler()
    e = pyopenms.MSExperiment()
    p.loadExperiment(self.testfile, e)
    show_mem("data loaded")
    li = []
    print("please be patient :")
    for k in range(5):
        sys.stdout.flush()
        li.append([ e[i] for i in range(e.size()) ])
        li.append([ e[i] for i in range(e.size()) ])
        print((20*k+20), "%")
    print("\n")
    show_mem("spectra list generated")
    del li
    show_mem("spectra list deleted")
    del p
    del e