t.onkey command isn't working

[PythonSnake]

i just need a bit of help because i just made a game called 'caterpillar' but when i tried running it it wouldnt work when i clicked space.

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import random import turtle as t   t.bgcolor('yellow')   caterpillar = t.Turtle() caterpillar.shape('square') caterpillar.color('red') caterpillar.speed(0) caterpillar.penup() caterpillar.hideturtle()   leaf = t.Turtle() leaf_shape = ((0, 0), (14, 2), (18, 6), (20, 20), (6, 18), (2, 14)) t.register_shape('leaf', leaf_shape) leaf.shape('leaf') leaf.color('green') leaf.penup() leaf.hideturtle() leaf.speed(0)   game_started = False text_turtle = t.Turtle() text_turtle.write('Press SPACE to start', align='center', font=('Arial', 16, 'bold')) text_turtle.hideturtle()   score_turtle = t.Turtle() score_turtle.hideturtle() score_turtle.speed(0)   def outside_window():     left_wall = -t.window_width() / 2     right_wall = t.window_width() / 2     top_wall = t.window_width() / 2     bottom_wall = -t.window_width() / 2     (x, y) = caterpiller.pos()     outside = \             x< left_wall or \             x> right_wall or \             y< bottom_wall or \             y> top_wall     return outside   def game_over():     caterpillar.colour('yellow')     leaf.colour('yellow')     t.penup()     t.hideturtle()     t.write('GAME OVER!', align='center', font=('Arial', 30, 'normal'))   def display_score(current_score):     score_turtle.clear()     score_turtle.penup()     x = (t.window_width() / 2) - 50     y = (t.window_height() / 2) -50     score_turtle.setpos(x, y)     score_turtle.write(str(current_score), align='right', font=('Arail', 40, 'bold'))   def place_leaf():     leaf.ht()     leaf.setx(random.randint(-200, 200))     leaf.sety(random.randint(-200, 200))     leaf.st()   def start_game():     global game_started     if game_started:         return     game_started = True       score = 0     text_turtle.clear()       caterpillar_speed = 2     caterpillar_length = 3     caterpillar.shapesize(1, caterpillar_length, 1)     caterpillar.showturtle()     display_score(score)     place_leaf()       while True:         caterpillar.forward(caterpillar_speed)         if caterpillar.distance(leaf) < 20:             place_leaf()             caterpillar_length = caterpillar_length + 1             caterpillar.shapesize(1, caterpillar_length, 1)             caterpillar_speed = caterpillar_speed + 1             score = score + 10         if outside_window():             game_over()             display_score(score)             break       def move_up():         if caterpillar.heading() == 0 or caterpillar.heading() == 180:             caterpillar.setheading(90)     def move_down():         if caterpillar.heading() == 0 or caterpillar.heading() == 180:             caterpillar.setheading(270)     def move_left():         if caterpillar.heading() == 90 or caterpillar.heading() == 270:             caterpillar.setheading(180)     def move_right():         if caterpillar.heading() == 90 or caterpillar.heading() == 270:             caterpillar.setheading(0)       t.onkey(start_game, 'Space')     t.onkey(move_up, 'Up')     t.onkey(move_right, 'Right')     t.onkey(move_down, 'Down')     t.onkey(move_left, 'left')     t.listen()     t.mainloop()

[Larz60+]

it wouldnt work when i clicked space.

Please be more specific, and post all error messages in their entirety, unaltered.

[PythonSnake]

i didn't get any error messages when i clicked run
all i got was a screen saying "Click SPACE to begin.