title: Python Seaborn: Plot multiple distplot in Facetgrid
body: <p>I have a dataframe which looks like below:</p>
  
  <p>df:</p>
  
  <pre><code>RY         MAJ_CAT                  Value
  2016    Cause Unknown              0.00227
  2016    Vegetation                 0.04217
  2016    Vegetation                 0.04393
  2016    Vegetation                 0.07878
  2016    Defective Equip            0.00137
  2018    Cause Unknown              0.00484
  2018    Defective Equip            0.01546
  2020    Defective Equip            0.05169
  2020    Defective Equip            0.00515
  2020    Cause Unknown              0.00050
  </code></pre>
  
  <p>I want to plot the distribution of the value over the given years. So I used distplot of seaborn by using following code:</p>
  
  <pre><code>year_2016 = df[df['RY']==2016]
  year_2018 = df[df['RY']==2018]
  year_2020 = df[df['RY']==2020]
  sns.distplot(year_2016['value'].values, hist=False,rug=True)    
  sns.distplot(year_2018['value'].values, hist=False,rug=True)   
  sns.distplot(year_2020['value'].values, hist=False,rug=True)
  </code></pre>
  
  <p>In the next step I want to plot the same value distribution over the given year w.r.t MAJ_CAT. So I decided to use Facetgrid of seaborn, below is the code :</p>
  
  <pre><code>g = sns.FacetGrid(df,col='MAJ_CAT')
  g = g.map(sns.distplot,df[df['RY']==2016]['value'].values, hist=False,rug=True))    
  g = g.map(sns.distplot,df[df['RY']==2018]['value'].values, hist=False,rug=True))    
  g = g.map(sns.distplot,df[df['RY']==2020]['value'].values, hist=False,rug=True))
  </code></pre>
  
  <p>However, when it ran the above command, it throws the following error:</p>
  
  <pre><code> KeyError: "None of [Index([(0.00227, 0.04217, 0.043930000000000004, 0.07877999999999999, 0.00137, 0.0018800000000000002, 0.00202, 0.00627, 0.00101, 0.07167000000000001, 0.01965, 0.02775, 0.00298, 0.00337, 0.00088, 0.04049, 0.01957, 0.01012, 0.12065, 0.23699, 0.03639, 0.00137, 0.03244, 0.00441, 0.06748, 0.00035, 0.0066099999999999996, 0.00302, 0.015619999999999998, 0.01571, 0.0018399999999999998, 0.03425, 0.08046, 0.01695, 0.02416, 0.08975, 0.0018800000000000002, 0.14743, 0.06366000000000001, 0.04378, 0.043, 0.02997, 0.0001, 0.22799, 0.00611, 0.13960999999999998, 0.38871, 0.018430000000000002, 0.053239999999999996, 0.06702999999999999, 0.14103, 0.022719999999999997, 0.011890000000000001, 0.00186, 0.00049, 0.13947, 0.0067, 0.00503, 0.00242, 0.00137, 0.00266, 0.38638, 0.24068, 0.0165, 0.54847, 1.02545, 0.01889, 0.32750999999999997, 0.22526, 0.24516, 0.12791, 0.00063, 0.0005200000000000001, 0.00921, 0.07665, 0.00116, 0.01042, 0.27046, 0.03501, 0.03159, 0.46748999999999996, 0.022090000000000002, 2.2972799999999998, 0.69021, 0.22529000000000002, 0.00147, 0.1102, 0.03234, 0.05799, 0.11744, 0.00896, 0.09556, 0.03202, 0.01347, 0.00923, 0.0034200000000000003, 0.041530000000000004, 0.04848, 0.00062, 0.0031100000000000004, ...)], dtype='object')] are in the [columns]"
  </code></pre>
  
  <p>I am not sure where am I making the mistake. Could anyone please help me in fixing the issue?</p>