# Simple interface to report execution times of program fragments.# Call TSTART() to reset the timer, TSTOP(...) to report times. import sys, os, time def TSTART():    global t0, t1    u, s, cu, cs = os.times()    t0 = u+cu, s+cs, time.time() def TSTOP(*label):    global t0, t1    u, s, cu, cs = os.times()    t1 = u+cu, s+cs, time.time()    tt = []    for i in range(3):        tt.append(t1[i] - t0[i])    [u, s, r] = tt    msg = ''    for x in label: msg = msg + (x + ' ')    msg = msg + '%r user, %r sys, %r real\n' % (u, s, r)    sys.stderr.write(msg)