simmon effect : build the funcion of trail list

#the real experiment for simon effect
#load the library which is our need
import pygame
import sys
import random
from pygame.locals import *

pygame.init()
win = pygame.display.set_mode((800,600),DOUBLEBUF|HWSURFACE)
left = (200,300)
right = (600,300)
red  =(255,0,0)
blue = (0,0,255)
black = (0,0,0)

#wait for the pressed key

def wait4key(duration,key_list):
    """the function is to wait for subject to press the right key , and the experient will continue untill the\
subject press the key
duration : the time which is the subject wait to press the key ,if the time is too long ,the experiment will\
continue automaticly.
key_list: the key which the subject need to press to continue the experiment, and the key_list must \
be a list such as [K_A,K_/]"""

    fake_bool =False
    time_out = False

    #empty the event before
    pygame.event.clear()

    #use for count the time
    start_time = pygame.time.get_ticks()

    #if the subject does not press the right key, he will in the while loop all the time untill the duration is exhausted
    while  not (fake_bool or time_out):
        end_time = pygame.time.get_ticks()
        #if the duration is too long , the experiment will continue
        if end_time - start_time > duration:
            time_out = True
        #if subject press the right key ,the experimet will continue
        for i in pygame.event.get():
            if i.type ==KEYDOWN:
                if i.key in key_list:
                    #prepare for the result of the function
                    response_time = pygame.time.get_ticks()
                    key_name = pygame.key.name(i.key)
                    #if has the right key ,the loop will quit
                    fake_bool = True
    #in the end, if subject press the key ,we will collect the time , and the name of the key
    if fake_bool:
        return start_time, response_time, key_name
    #the purpose of the next line is stay the same with the result
    else:
        return start_time, None, None

#experiment for 10 times

#creat the list
#L mean left ,R mean right , RE mean the color red, BL mean the color blue
lis = [ ["L","RE","Z"],
        ["L","BL","/"],
        ["R","RE","Z"],
        ["R","BL","/"]]

#creat a function to ran one trial
def one_trial_list(pars):
#the parameters must be a list which contains the location, color ,right response of the stimuli and the the sequence of the element of parameters should not change"""
    global left
    global right
    global red
    global blue
    global black
    loc,col,ress=pars
    if loc =="L":
        pos = left
    if loc =="R":
        pos = right
    if col =="BL":
        color = red
    if col == "RE":
        color = blue

    win.fill(black)
    pygame.draw.circle(win,color,pos,20,0)
    pygame.display.flip()
    result = wait4key(2000,[K_z,K_SLASH])
    print(result)

#random our lis which contains four trails
lis1 = lis*2
random.shuffle(lis1)

#run four trials
for i in lis1:
    one_trial_list(i)

    #when one trail end ,fill the window black again
    win.fill(black)
    pygame.display.flip()
    pygame.time.delay(500)
pygame.quit()
sys.exit()

another function to improve our experiment

the result