title: Count the frequency of words from a column in Python using external csv file
body: <p>This question was asked before by <a href="https://stackoverflow.com/users/907629/user907629">user907629</a>, and <a href="https://stackoverflow.com/users/655183/maria-zverina">Maria Zverina</a> answered the question, but she didn't import the data from external csv file.</p>
  
  <p>My file contains more than 800000 records, and I want to import an external csv file. What changes should be done in this <a href="https://stackoverflow.com/questions/11396665/count-the-frequency-of-words-from-a-column-in-python">frequency count</a> code?</p>