# Need help with rock paper scissors in pyhon

i have problems that i don`t relley understand i get an error that says
Line 28: KeyError: rock
or down here
"""
@ Clever Programmer
Rock paper scissors
"""
import random
import simplegui

COMPUTER_SCORE = 0
HUMAN_SCORE = 0
human_choice = ""
computer_choice = “”

def choice_to_number(choice):
""“Convert choice to number.”""

``````return{'rock':0, 'paper':1,'scissors':2}[choice]
``````

def number_to_choice(number):
""“Convert number to choice.”""
# If number is 0, give me ‘rock’
# If number is 1, give me ‘paper’
# If number is 2, give me 'scissors’
return {0: ‘rock’, 1: ‘paper’, 2:‘scissors’}[number]

def random_computer_choice():
""“Choose randomly for computer.”""
return random.choice([‘rock’,‘paper’,‘scissors’])

def choice_result(human_choice, computer_choice):
""“Return the result of who wins.”""

``````# DO NOT REMOVE THESE GLOBAL VARIABLE LINES.
global COMPUTER_SCORE
global HUMAN_SCORE

human_number= choice_to_number(human_choice)
computer_number= number_to_choice(computer_choice)

if (human_number - computer_number) % 3 ==1:
print("computer wins")
COMPUTER_SCORE += 1

elif human_choice == computer_choice:
print("draw ")

else:
print("human wins")
HUMAN_SCORE += 1
``````

# They will test your code.

def test_choice_to_number():
assert choice_to_number(‘rock’) == 0
assert choice_to_number(‘paper’) == 1
assert choice_to_number(‘scissors’) == 2

def test_number_to_choice():
assert number_to_choice(0) == 'rock’
assert number_to_choice(1) == 'paper’
assert number_to_choice(2) == ‘scissors’

def test_all():
test_choice_to_number()
test_number_to_choice()

test_all()

# This code is for the GUI part of the game.

def rock():
global human_choice, computer_choice
global HUMAN_SCORE, COMPUTER_SCORE

``````human_choice = 'rock'
computer_choice = random_computer_choice()
choice_result(computer_choice, human_choice)
``````

def paper():
global human_choice, computer_choice
global HUMAN_SCORE, COMPUTER_SCORE

``````human_choice = 'paper'
computer_choice = random_computer_choice()
choice_result(computer_choice, human_choice)
``````

# Handler for mouse click on paper button.

def scissors():
global human_choice, computer_choice
global HUMAN_SCORE, COMPUTER_SCORE

``````human_choice = 'scissors'
computer_choice = random_computer_choice()
choice_result(computer_choice, human_choice)
``````

# Handler to draw on canvas

def draw(canvas):

``````try:
# Draw choices
canvas.draw_text("You: " + human_choice, [10,40], 48, "Green")
canvas.draw_text("Comp: " + computer_choice, [10,80], 48, "Red")

# Draw scores
canvas.draw_text("Human Score: " + str(HUMAN_SCORE), [10,150], 30, "Green")
canvas.draw_text("Comp Score: " + str(COMPUTER_SCORE), [10,190], 30, "Red")

except TypeError:
pass
``````

# Create a frame and assign callbacks to event handlers

def play_rps():
frame = simplegui.create_frame(“Home”, 300, 200)
``````# Start the frame animation