title: AttributeError: 'numpy.ndarray' object has no attribute 'set_aspect'
body: <p>When I write the code:</p>
  <pre><code>for i in iaq:
  
  fig, ax = plt.subplots(8,5,figsize=(8,5))
  df_g2[df_g2['aq_date'] == i].plot(column='zone_id', cmap='Greens', ax=ax, legend=True)
  ax.set_title('Analysis :'+ str(i))
  plt.show()
  </code></pre>
  <p>it shows the following error:</p>
  <pre><code>AttributeError: 'numpy.ndarray' object has no attribute 'set_aspect'
  </code></pre>
  <p>How to solve this?</p>