title: Python convert large(10GB) .csv to .tsv
body: <p>New to python. Want to convert the large csv file to tsv. </p>
  
  <pre><code>import re
  with open("D:/AddressEvaluation/NAD/NAD.csv", 'r') as myfile:
  with open("D:/NAD.txt", 'w') as csv_file:
  for line in myfile:
    fileContent = re.sub(",", "\t", line)
    csv_file.write(fileContent)
  </code></pre>
  
  <p>Am I missing something? Correct me If I am wrong.</p>