title: ValueError: invalid color argument in my pygame code
body: <p>I wrote the code for my final project. It's a code that makes a bouncing on the wall. I wanted to make two balls, so I created a class and created several functions. But I think that my code is not working.</p>
  <pre><code>ValueError: invalid color argument in my pygame code
  </code></pre>
  <hr />
  <pre><code>import pygame
  import random
  
  pygame.init()  
  screensize = (800, 600)
  screen = pygame.display.set_mode(screensize) 
  pygame.display.set_caption(&quot;Final project&quot;) 
  
  WHITE = (255, 255, 255)
  GREEN = (0, 255, 0)
  BLUE = (0, 0, 255)
  RED = (255, 0, 0)
  
  radius = 25  # 공의 크기
  color_list = [RED, BLUE, GREEN]
  
  x = 0
  y = 0
  x1 = 0
  y1 = 0
  dx = 2
  dy = 2
  color = color_list
  
  
  class ball:
  
  def create_ball(self):
      self.x = random.randint(radius, screensize[0]-radius)
      self.y = random.randint(radius, screensize[1]-radius)
      self.x1 = random.randint(radius, screensize[0]-radius)
      self.y1 = random.randint(radius, screensize[1]-radius)
      self.color = random.choice(color_list)
  
  def move_ball(self):
      self.x = x + dx
      self.y = y + dy
  if not radius &lt; x &lt; screensize[0]-radius:
      dx = -dx
      color = random.choice(color_list)
  elif not radius &lt; y &lt; screensize[1]-radius:
      dy = -dy
      color = random.choice(color_list)
  
  def move_ball1(self):
      self.x1 = x1 + dx
      self.y1 = y1 + dy
  if not radius &lt; x1 &lt; screensize[0]-radius:
      dx = -dx
      color = random.choice(color_list)
  elif not radius &lt; y1 &lt; screensize[1]-radius:
      dy = -dy
      color = random.choice(color_list)
  
  
  b = ball()
  print(b)
  
  
  go = True
  while go:
      clock = pygame.time.Clock() 
      clock.tick(150) 
      for event in pygame.event.get():  
          if event.type == pygame.QUIT:  
              go = False  
  
      screen.fill(WHITE)  
      pygame.draw.circle(screen, color, (x, y), radius)
      pygame.draw.circle(screen, color, (x1, y1), radius)
      pygame.display.flip() 
  </code></pre>