Collision of Two Rect

[Alex Gardner]

When rect A collides with rect B they stick when I am wanting A to bounce off of B.  I have tried different methods, but none seem to work.  My source is here:  http://pastebin.com/CBYPcubL

The collision code itself is below:
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# Bounce off of the paddle
if paddle_rect.colliderect(ball_rect):
    y_vel*=-1
    x_vel*=-1