擅长:python、mysql、java
<p>你在找<a href="https://matplotlib.org/api/pyplot_api.html#matplotlib.pyplot.axhline" rel="noreferrer">axhline</a>(一条水平轴线)。例如,下面将给出y=0.5的水平线。</p>
<pre><code>import matplotlib.pyplot as plt
plt.axhline(y=0.5, color='r', linestyle='-')
plt.show()
</code></pre>
<p><a href="https://i.stack.imgur.com/bGUX7.png" rel="noreferrer"><img src="https://i.stack.imgur.com/bGUX7.png" alt="sample figure"/></a></p>