title: 'TypeError: Scalar value for argument 'color' is not numeric' when using opencv-python drawing a circle
body: <p>I'm new to opencv.Some weird things happened when I drew a circle.It didn't work when I tried to pass c2 to the circle function,but it worked well when I pass c1 to the color argument. But <strong>c1 == c2</strong>. </p>
  
  <p>Here is my code:</p>
  
  <pre><code>import cv2
  import numpy as np 
  
  canvas = np.zeros((300, 300, 3), dtype='uint8')
  for _ in range(1):
      r = np.random.randint(0, 200)
      center = np.random.randint(0, 300, size=(2, )) 
      color = np.random.randint(0, 255, size=(3, ))
      c1 = tuple(color.tolist())
      c2 = tuple(color)
      print('c1 == c2 : {} '.format(c1 == c2))
      cv2.circle(canvas, tuple(center), r, c2, thickness=-1)
  
  cv2.imshow('Canvas', canvas)
  cv2.waitKey(0)
  </code></pre>
  
  <p>when I use c2,the console printed:'TypeError: Scalar value for argument 'color' is not numeric',but why it happened when <strong>c1 == c2</strong>?Thanks.</p>