title: Circle Plot with Color Bar
body: <p>I'm trying to do a Circle Plot with a Color Bar, almost like this:</p>
  
  <p><a href="https://i.stack.imgur.com/yERnR.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yERnR.png" alt="enter image description here"></a></p>
  
  <p>However, the minimum value of the colour bar is currently 1; I would like to be able to set it to 0.</p>
  
  <pre><code>import pandas            as pd
  import matplotlib.pyplot as plt
  import matplotlib.cm     as cm
  from sklearn import preprocessing
  
  df = pd.DataFrame({'A':[1,2,1,2,3,4,2,1,4], 
                     'B':[3,1,5,1,2,4,5,2,3], 
                     'C':[4,2,4,1,3,3,4,2,1]})
  
  # set the Colour
  x              = df.values
  min_max_scaler = preprocessing.MinMaxScaler()
  x_scaled       = min_max_scaler.fit_transform(x)
  df_S           = pd.DataFrame(x_scaled)
  c1             = df['C']
  c2             = df_S[2]
  colors         = [cm.jet(color) for color in c2]
  
  # Graph
  plt.figure()
  ax = plt.gca()
  for a, b, color in zip(df['A'], df['B'], colors):
      circle = plt.Circle((a, 
                           b), 
                           1, # Size
                           color=color, 
                           lw=5, 
                           fill=False)
      ax.add_artist(circle)
  
  plt.xlim([0,5])
  plt.ylim([0,5])
  plt.xlabel('A')
  plt.ylabel('B')
  ax.set_aspect(1.0)
  
  sc = plt.scatter(df['A'], 
                   df['B'], 
                   s=0, 
                   c=c1, 
                   cmap='jet', 
                   facecolors='none')
  plt.grid()
  
  cbar = plt.colorbar(sc)
  cbar.set_label('C', rotation=270, labelpad=10)
  
  plt.show()
  </code></pre>
  
  <p>Credit to this original question:
  <a href="https://stackoverflow.com/questions/47563373/plotting-circles-with-no-fill-colour-size-depending-on-variables-using-scatte/50992630#50992630">Plotting circles with no fill, colour &amp; size depending on variables using scatter</a></p>