title: Matplotlib Sankey labels and values
body: <p>I'm working on a Sankey diagram and I'm experiencing some issues with the labeling process. Is there a way to put the labels and the values of each flow on the same line? I would like them to look like this: "Label: value".</p>
  
  <p>Here are the code and the resulting diagram. </p>
  
  <pre class="lang-py prettyprint-override"><code>from matplotlib import pyplot as plt
  from matplotlib.sankey import Sankey
  
  fig = plt.figure(figsize=(8.3, 11.7))
  ax = fig.add_subplot(1, 1, 1)
  plt.axis('off')
  
  # these will be provided soon
  # Input = ...
  # L0 = ...
  # L1, L2, L3, L4, L5, L6, L7, L8, L9 = ...
  # F9 = ...
  
  sankey = Sankey(ax=ax,
                  scale=1 / Input,
                  offset=0.6,
                  head_angle=135,
                  shoulder=0,
                  gap=0.2,
                  radius=0.1,
                  format='%.1f',
                  unit='%')
  s0 = sankey.add(flows=[Input, -L0, -(Input - L0)],
                  labels=['Input 1', 'Loss 0', ''],
                  orientations=[0, 1, 0],
                  trunklength=1,
                  rotation=-90,
                  fc='crimson', alpha=0.8)
  s1 = sankey.add(flows=[Input - L0, -L1, -L2, -L3, -L4, -L5, -L6, -L7, -L8, -L9, -F9],
                  labels=['Input 2', 'Loss 1', 'Loss 2', 'Loss 3', 'Loss 4', 'Loss 5', 'Loss 6', 'Loss 7', 'Loss 8',
                          'Loss 9', 'Output'],
                  orientations=[0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0],
                  trunklength=1,
                  rotation=-90,
                  prior=0, connect=(2, 0),
                  fc='crimson', alpha=0.6)
  diagrams = sankey.finish()
  for d in diagrams:
      for t in d.texts:
          t.set_fontsize(10)
          t.set_horizontalalignment('center')
          t.set_verticalalignment('center')
  
  diagrams[0].texts[0].set_position(xy=[0, 0.4])
  diagrams[0].texts[2].set_position(xy=[10, 10])
  
  plt.show()
  </code></pre>
  
  <p>Sankey diagram</p>
  
  <p><a href="https://i.stack.imgur.com/aNBr8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/aNBr8.png" alt="the resulting output"></a></p>