tentative test of psychopy response latency. Is this the recommended way to record response time?

tentativePsychopyRespTime.py

from psychopy import visual, event, core
import numpy as np
"""Record response latency
"""
trialClock = core.Clock()

Hz = 60
#create a window to draw in
bgColor=np.array([-1,-1,-1])
scrn = 0; fullscrn= 0
myWin =visual.Window(color=bgColor, allowGUI=False,screen=scrn,fullscr=fullscrn, units='pix',waitBlanking=False)
respText = visual.TextStim(myWin,pos=(0, 0),color=(1,1,1),colorSpace='rgb',alignHoriz='center', alignVert='center', units='norm',autoLog=False)
respText.setText('Press up arrow for up, down arrow for down')
core.wait(.2)
for i in xrange(50): #go through 50 frames that show nothing. 
    #Because sometimes the operating system / graphics pipeline needs to clean up its act before accurate timing ensues
    myWin.flip()
    
maxRespTime = 5 #sec
frame = 0
respMade = False
stopExp = False

respText.draw()
myWin.flip()
trialClock.reset()
while not respMade and (frame < maxRespTime*Hz) and not stopExp:
    
    frame += 1
    for key in event.getKeys():
         if key in ['up','down']: #up arrow or down arrow
            respLatencySecs = trialClock.getTime()
            respLatencyFrames = frame
            respMade = True
            if key=='up':
                resp = 1
            if key=='down':
                resp = -1
         #check if pressed abort-type key
         if key in ['escape','q']: #end experiment
            stopExp=True
            
    respText.draw()
    myWin.flip()

print 'respMade = ',respMade
if respMade:
    print 'Response latency according to trialClock = ', np.around(respLatencySecs,3), 'seconds'
    print 'According to number of frames that have flipped (', np.around(frame,0), ') = ',np.around(frame*1.0/Hz,3), ' seconds'
    diffClockFrameCounter = abs(respLatencySecs-frame*1.0/Hz)
    print 'Difference = ',diffClockFrameCounter, ' and frame precision is ', np.around(1.0/Hz,3), 
    if diffClockFrameCounter > 1.0/Hz:
       print " so something's out of whack."
    else: print " so that's no worse from the frame clock than expected."