title: Cannot create plot using pandas.dataframe.hist()
body: <p>This is my code:</p>
  
  <pre><code>import pandas as pd
  df = pd.DataFrame({'value1': [1, 5, 9], 'value2': [56, 84, 98]})
  df.hist()
  </code></pre>
  
  <p>but no plot popped up, the program just ran and stopped.
  I'm sure I have all the required packages, and I can plot with matplotlib like:</p>
  
  <pre><code>import matplotlib.pyplot as plt
  import pandas as pd
  df = pd.DataFrame({'value1': [1, 5, 9], 'value2': [56, 84, 98]})
  plt.scatter(df['value1'], df['value2'])
  plt.show()
  </code></pre>
  
  <p>I'm using windows 10 pro, python 3.6.4.</p>