title: Python - pandas Avoid splitting string columns when writing to csv file
body: <p>This is the sample of my code
  when I write the dataframe into csv, <code>9 October 1937</code> and <code>81 years ago (1937-10-09)</code> are coming in different columns.</p>
  
  <pre><code>import pandas as pd
  df = pd.DataFrame({'established':['9 October 1937, 81 years ago (1937-10-09)','1996'],'location':['hyd','Delhi']})
  df.to_csv('some_file.csv')
  </code></pre>
  
  <p>How to make <code>9 October 1937, 81 years ago (1937-10-09)</code> should be coming in same column??
  Thanks </p>