title: Terminal having trouble displaying histograms
body: <p>I am working through some coursework and when I run the required code in a terminal window I do not get an output of a histogram like the book says I should.</p>
  <pre><code>    import pandas as pd
      import numpy as np
      import matplotlib
      bank_train = pd.read_csv(&quot;~/Downloads/Data/bank_marketing_training&quot;)
      bank_train['index'] = pd.Series(range(0,26874))
      bank_train['days_since_previous'] = bank_train['days_since_previous'].replace({999: np.NaN})
      bank_train['days_since_previous'].plot(kind = 'hist', title = 'Histogram of Days Since Previous')
  </code></pre>
  <p>For the output I get:</p>
  <pre><code>&lt;AxesSubplot:title={'center':'Histogram of Days Since Previous'}, ylabel='Frequency'&gt;
  </code></pre>
  <p>Thanks in advance for any help</p>