title: Plot a bubble chart using plotly
body: <p>I am working to plot some data in a Bubble Chart using plotly. I have written this code: (based on <a href="https://plot.ly/python/bubble-charts/" rel="nofollow noreferrer">Plotly's examples</a>)</p>
  
  <pre><code>trace0 = go.Scatter(
      x=output['mean'],
      y=output['count'],
      text=output.index,
      mode='markers',
      marker=dict(
          color=['rgb(93, 164, 214)', 'rgb(255, 144, 14)',  'rgb(44, 160, 101)', 'rgb(255, 65, 54)'],
          size=output['total'],
      )
  )
  
  data = [trace0]
  plot_url = py.plot_mpl(trace0, filename='mpl-7d-bubble')
  </code></pre>
  
  <p>I am trying to plot <code>output['mean']</code> on the x axis and <code>output['count']</code> on the y. I would like to plot the size on <code>output['total'].</code> When it is run, this error is received:</p>
  
  <pre><code>Traceback (most recent call last):
    File "..data.py", line 45, in &lt;module&gt;
      plot_url = py.plot_mpl(data, filename='mpl-7d-bubble')
    File "...anaconda/lib/python3.5/site-packages/plotly/plotly/plotly.py", line 307, in plot_mpl
      fig = tools.mpl_to_plotly(fig, resize=resize, strip_style=strip_style)
    File ".../anaconda/lib/python3.5/site-packages/plotly/tools.py", line 507, in mpl_to_plotly
      matplotlylib.Exporter(renderer).run(fig)
    File ".../anaconda/lib/python3.5/site-packages/plotly/matplotlylib/mplexporter/exporter.py", line 45, in run
      fig.savefig(io.BytesIO(), format='png', dpi=fig.dpi)
  AttributeError: 'list' object has no attribute 'savefig'
  </code></pre>
  
  <p><strong>EDIT:</strong> Contents of <code>output</code> pandas dataframe:</p>
  
  <pre><code>             count     location        mean        total
  StartLocation                                             
  ?                  6            ?    9.527778    57.166667
  bathroom          14     bathroom   20.409524   285.733333
  bedroom           61      bedroom   96.837432  5907.083333
  bedroom2          22     bedroom2  165.262121  3635.766667
  hallway            6      hallway    0.394444     2.366667
  kitchen           79      kitchen    8.646624   683.083333
  living room       56  living room   93.855655  5255.916667
  outside            6      outside  325.991667  1955.950000
  setup              1        setup    0.050000     0.050000
  study             18        study   18.099074   325.783333
  toilet            51       toilet    7.198693   367.133333
  </code></pre>