title: Unsure how to use colormap with Folium marker plot
body: <p>I have a dataframe with latitude, longitude, and power percentage. I want to do something very simple but not sure how: apply a colormap to color the data points based on their percentage. So 90% is red and 100% is blue. I have created both a successful map and colormap, but not sure how to proceed next. </p>
  
  <pre class="lang-py prettyprint-override"><code>import folium
  import pandas as pd
  import folium.plugins
  
  import branca
  import branca.colormap as cm
  
  data = [
      [33.823400, -118.12194, 99.23],
      [33.823500, -118.12294, 95.23],
      [33.823600, -118.12394, 91.23],
      [33.823700, -118.12494, 90.00]
  ]
  
  df = pd.DataFrame(data, columns=['latitude','longitude','power'])
  
  x_start = (df['latitude'].max() + df['latitude'].min()) / 2
  y_start = (df['longitude'].max() + df['longitude'].min()) / 2
  start_coord = (x_start, y_start)
  
  map = folium.Map(location=start_coord, zoom_start=12)
  
  lat = list(df.latitude)
  lon = list(df.longitude)
  
  for loc in zip(lat, lon):
      folium.Circle(
          location=loc,
          radius=10,
          #fill=True,
          #color='blue',
          #fill_opacity=0.7
      ).add_to(map)
  
  display(map)
  
  colormap = cm.LinearColormap(colors=['red','lightblue'], index=[90,100],vmin=90,vmax=100)
  colormap
  </code></pre>