title: how to plot lat and long from pandas dataframe on folium map group by some labels
body: <p>I have pandas dataframe like following</p>
  
  <pre><code>Latitude          Longitude          Class
   40.7145           -73.9425            A
   40.7947           -73.9667            B
   40.7388           -74.0018            A
   40.7539           -73.9677            B
  </code></pre>
  
  <p>I want to plot above on folium map which will also display class associated with lat and long.<br>
  I am using following code.</p>
  
  <pre><code>import folium
  
  map_osm = folium.Map(location=[40.742, -73.956])
  train_df.apply(lambda row:folium.CircleMarker(location=[row["Latitude"], 
                                                    row["Longitude"]]).add_to(map_osm),
       axis=1)
  </code></pre>
  
  <p>How to plot and display class as well so that on map its easier to understand Class wise distribution of points.</p>