擅长:python、mysql、java
<p>您的代码在<code>matplotlib 2.2.2</code>上运行良好。不过,您可以尝试一下<a href="https://stackoverflow.com/a/19863736/4932316">this answer</a>中建议的以下解决方案。在</p>
<pre><code>CS_elem,_ = CS.legend_elements()
leg = ax.legend(CS_elem, ['-X**2 - Y**3'], loc='lower left',
framealpha=1)
frame = leg.get_frame()
frame.set_facecolor('blue')
</code></pre>
<p><a href="https://i.stack.imgur.com/pmbyk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pmbyk.png" alt="enter image description here"/></a></p>