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    <p>The reason the sprites sometimes become immobile after colliding is because of this code here:</p> <pre><code>pacman_velocity[0] = randint(-1,1) pacman_velocity[1] = randint(-1,1) </code></pre> <p>randint for that range means you're getting an integer value that is either -1, 0, or 1.<br> From the docs: (<a href="http://docs.python.org/2/library/random.html" rel="nofollow">http://docs.python.org/2/library/random.html</a>)</p> <pre><code>random.randint(a, b) Return a random integer N such that a &lt;= N &lt;= b </code></pre> <p>That means that (theoretically) each time there is a collision, there is a 1/3 chance that the x component of the velocity will be 0, and a 1/3 chance that the y component of the velocity will be zero. If you only want to select either 1 or -1, try the random.choice() function:</p> <pre><code>pacman_velocity[0] = random.choice((-1, 1)) pacman_velocity[1] = random.choice((-1, 1)) </code></pre> <p>If you wanted to include 0 as a possibility, but want to reduce its frequency, you could accomplish that with something like this:</p> <pre><code>pacman_velocity[0] = random.choice((-1, -1, -1, 0, 1, 1, 1)) pacman_velocity[0] = random.choice((-1, -1, -1, 0, 1, 1, 1)) </code></pre> <p>The problem with this loop you tried:</p> <pre><code>For sprite in sprite_list(): sprite.left &lt; 0 or sprite.right &gt; WIDTH: sprite_velocity[1] = -1 * sprite_velocity[1] </code></pre> <p>is that you are checking to see if the sprite has passed the left or right boundary of the screen, but then instead of reversing the x component of the sprite's velocity, you are reversing the y component of the velocity. Also, you don't have an <code>if</code> at the beginning of the condition. Try this:</p> <pre><code>For sprite in sprite_list: if sprite.left &lt; 0 or sprite.right &gt; WIDTH: sprite_velocity[0] = -1 * sprite_velocity[0] if sprite.top &lt; 0 or sprite.bottom &gt; HEIGHT: sprite_velocity[1] = -1 * sprite_velocity[1] </code></pre>
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    1. COWhat could I use instead of randint to prevent the 33% chance of getting 0 as a value?
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    2. COWhat is the actual range of values you would like to see? Do you really only want to set it to 1 or -1?
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    3. COI edited my answer to give a solution for if you only want to select either 1 or -1.
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