title: Python heatmap plot colorbar
body: <p>I am working on a plot which looks like this so far:</p>
  <p><a href="https://i.stack.imgur.com/xHtoW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/xHtoW.png" alt="enter image description here" /></a></p>
  <p>And I am using the following code:</p>
  <pre><code>import matplotlib.pyplot as plt
  import numpy as np
  column_labels = ['A','B']
  row_labels = ['A','B']
  data = np.random.rand(2,2)
  print(type(data))
  data = np.array([[1, 0.232], [0.119, 1]])
  fig, ax = plt.subplots()
  heatmap = ax.pcolor(data, cmap=plt.cm.Blues)
  
  # put the major ticks at the middle of each cell
  ax.set_xticks(np.arange(data.shape[0])+0.5, minor=False)
  ax.set_yticks(np.arange(data.shape[1])+0.5, minor=False)
  
  # want a more natural, table-like display
  ax.invert_yaxis()
  ax.xaxis.tick_top()
  
  ax.set_xticklabels(row_labels, minor=False)
  ax.set_yticklabels(column_labels, minor=False)
  plt.show()
  </code></pre>
  <p>What I am trying to get is something like this one:</p>
  <p><a href="https://i.stack.imgur.com/5sFDv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/5sFDv.png" alt="enter image description here" /></a></p>
  <p>Where I can see the color bar as well as value of the cells on them. What would I need to add to my code to get these?</p>
  <p>Thanks</p>