What means the comma in matplotlib? - python : <p>I can't understand the logic behind the 3rd line:</p>

<pre><code>fig = plt.figure()
fig.suptitle("No axes in this figure", fontsize=12)
fig, ax_lst = plt.subplots(2, 2)
</code></pre>

<p>1st line: Plot the empty figure.</p>

<p>2nd line: Title.</p>

<p>3rd line: Put the graphs in the figure, but how? What's the logic? What means the comma there? (I know that <code>a+b=11</code> if <code>a,b=1+1,2+2+3</code></p>
