title: How to Annotate Bars in a Seaborn Facetgrid (works in Factorplot)
body: <p>I'm trying to overlay a value to each bar into each plot of a 4x4 Seaborn Facetgrid. The below works in a Factorplot. How do I amend it to work in a facetgrid?  Targeting g.axes.flat.patches doesn't seem to work either.</p>
  
  <pre><code> # Annotate a value into each bar in each plot (Doesn't work)
   # Error: AttributeError: 'numpy.flatiter' object has no attribute 'patches'
  
      for p in g.axes.flat.patches:
          g.annotate("{:.1f}".format(p.get_height()) , 
                      (p.get_x() + p.get_width() / 2., p.get_height()-fudge), # Placement
                      ha='center', va='center', fontsize=12, color='white', rotation=0, xytext=(0, 20),
                      textcoords='offset points')
  </code></pre>
  
  <p>Many thanks in advance </p>
  
  <p>(Shortened example for facetgrid below)</p>
  
  <pre><code>melt =df.ix[:, np.r_[14:15, 28:29, 167:171]]
  
  # Melt 
  melted =  pd.melt(melt, id_vars=['region','age'],
                    var_name='vote_method', 
                    value_name='popularity').dropna().sort_values(by="region")
  
  g = sns.FacetGrid(melted, row="region", col="vote_method", hue="age",
                    palette=flatui, 
                    sharex=False, sharey=True,size=10, aspect=2)
  
  # Have to pass interval in to get keep the X axis ordered
  g.map(sns.barplot, 'age', 'pref', order=melted.age.unique())
  
  
  g.set_titles(size=32, fontweight='light', fontname='Helvetica Neue', 
               alpha=1, color= '#404040')
  
  
  # Adjust the arrangement of the plots in the facetgrid
  g.fig.tight_layout(pad=5)
  
  # Annotate a value into each bar in each plot
  for p in g.axes.flat.patches:
      g.annotate("{:.1f}".format(p.get_height()) , 
                  (p.get_x() + p.get_width() / 2., p.get_height()-fudge), # Placement
                  ha='center', va='center', fontsize=12, color='white', rotation=0, xytext=(0, 20),
                  textcoords='offset points')
  </code></pre>