def METHOD_NAME(self):
    p = pyopenms.FileHandler()
    e1 = pyopenms.MSExperiment()
    p.loadExperiment(self.testfile, e1)
    show_mem("data loaded")
    specs = list(e1)
    for s in specs:
        for _ in range(10):
            e1.addSpectrum(s)
    li = []
    print("please be patient :")
    N = 5
    for k in range(N):
        sys.stdout.flush()
        for __ in range(400):
            e2 = copy.copy(e1)
            li.append(e2)
            e1 = copy.copy(e2)
            li.append(e1)
        print(int(100.0*(k+1)/N), "%")
    print("\n")
    show_mem("experiment list generated")
    del li
    del e1
    del e2
    del p
    show_mem("experiment list deleted")