title: AttributeError: 'numpy.ndarray' object has no attribute 'boxplot'
body: <p>I try to plot some graphs using seaborn.boxplot(). Here's my code:</p>
  <pre><code>import seaborn as sbn 
  import pandas as pd
  import matplotlib.pyplot as plt
  
  fig, axes = plt.subplots(figsize = (15,8), nrows=2, ncols=3);
  sbn.boxplot(y=df['national_rank'], orient='v', ax=axes[0], palette='Oranges')
  sbn.boxplot(y=df['world_rank'], orient='v', ax=axes[1])
  sbn.boxplot(y=df['quality_of_education'], orient='v', ax=axes[2])
  
  sbn.boxplot(y=df['alumni_employment'], orient='v', ax=axes[3], palette='Oranges')
  sbn.boxplot(y=df['quality_of_faculty'], orient='v', ax=axes[4], palette='Oranges')
  sbn.boxplot(y=df['publications'], orient='v', ax=axes[5], palette='Oranges')
  
  ---------------------------------------------------------------------------
  AttributeError                            Traceback (most recent call last)
  &lt;ipython-input-105-3c63c384eb3b&gt; in &lt;module&gt;()
        1 fig, axes = plt.subplots(figsize = (15,8), nrows=2, ncols=3);
  ----&gt; 2 sbn.boxplot(y=df['national_rank'], orient='v', ax=axes[0], palette='Oranges')
        3 sbn.boxplot(y=df['world_rank'], orient='v', ax=axes[1])
        4 sbn.boxplot(y=df['quality_of_education'], orient='v', ax=axes[2])
        5 
  
  3 frames
  /usr/local/lib/python3.7/dist-packages/seaborn/categorical.py in draw_boxplot(self, ax, kws)
      439                     continue
      440 
  --&gt; 441                 artist_dict = ax.boxplot(box_data,
      442                                          vert=vert,
      443                                          patch_artist=True,
  
  AttributeError: 'numpy.ndarray' object has no attribute 'boxplot'
  </code></pre>
  <p>What can I do wrong? I can't understand what it can be. Thanks a lot for your help.</p>