title: Check if certain value is contained in a dataframe column in pandas
body: <p>I am trying to check if a certain value is contained in a python column. I'm using <code>df.date.isin(['07311954'])</code>, which I do not doubt to be a good tool. The problem is that I have over 350K rows and the output won't show 
  all of them so that I can see if the value is actually contained. Put simply, I just want to know (Y/N) whether or not a specific value is contained in a column. My code follows:</p>
  
  <pre><code>import numpy as np
  import pandas as pd
  import glob
  
  
  df = (pd.read_csv('/home/jayaramdas/anaconda3/Thesis/FEC_data/itpas2_data/itpas214.txt',\
      sep='|', header=None, low_memory=False, names=['1', '2', '3', '4', '5', '6', '7', \
      '8', '9', '10', '11', '12', '13', 'date', '15', '16', '17', '18', '19', '20', \
      '21', '22']))
  
  df.date.isin(['07311954'])
  </code></pre>