def METHOD_NAME(self):
    pc = pyopenms.Precursor()
    allpcs = 500*[pc]
    li = []
    for i in range(500):
        if (i+1)%100 == 0:
            show_mem("%4d runs" % i)
        spec = pyopenms.MSSpectrum()
        spec.setPrecursors(allpcs)
        spec.setPrecursors(allpcs)
        li.append(spec)
        del spec
    del li