擅长:python、mysql、java
<p><a href="https://stackoverflow.com/a/11846756/216356">This answer</a>有一些示例<code>move</code>方法。也许看看他们是怎么写的会有帮助吗?在</p>
<p><strong>划桨。移动()</strong></p>
<pre><code>def move(self, *, up=False, down=False):
if up or (not down and self.keys.up and
self.position.y - self.size.y > 0):
self.position -= Point(0, self.move_by)
if down or (not up and self.keys.down and
self.position.y + self.size.y < self.height):
self.position += Point(0, self.move_by)
</code></pre>
<p><strong>球。移动()</strong></p>
^{pr2}$