how can i get reaction time in python?

Question

I am unable to get the right time of reaction.

Following is my attempt on achieving it:

kb = keyboard.Keyboard()
RT = core.Clock()

def run(data):
    trial=0 
    for j in range(1,5):
        for i in data:
            kb.clock.reset()
            excelTrialEq = trial
            print (i)
            myword.text=i[0]
            myword.draw()
            mywin.flip() #draw letter 

            RT.reset()           
            RT.add((0.25) + i[1]
            core.wait(0.25)
            mywin.flip() #draw blank(ISI)

            while RT.getTime() < 0 : pass # wait till end stimulus showing + ISI 

i expect the output like

['M', 1]
1 2 M 1
space, 0.50980908090
...

but the actual output is

['M', 1]
1 2 M 1
['K', 1]
space -0.25774913992427173
...

Answer 1

It is not really clear from your code what you want to do. However, if I understand correctly you show something on the screen and wait for the user to press the spacebar. The most simple thing to do would be this:

import time

#When the item appears on the screen
startTime = time.time()

#When the user presses space
endTime = time.time()

reactionTime = endTime - startTime