freya | Python Fiddle

import hashlib
import csv
import io
import datetime
import time
import sys
import os

DEFINED_EXAMPLE_HASH = '264e53d93759bde067fd01ef2698f98d1253c730d12f021116f02eebcfa9ace6'
TODAY = datetime.datetime.today()

def hash_string_256(string):
  new_hash = hashlib.sha256(string)
  hashed_version = new_hash.hexdigest()
  return hashed_version

def scrub(string):
  return string.strip().lower()

def main():
  BUF_SIZE = 96000*1024 #a little below 100 MB to avoid just meeting the 100MB limit
  user_file_name = raw_input('Enter the csv file name: ')
  csv_file = csv.reader(open(user_file_name, 'rU'))
  cur_time = time.strftime("%Y%m%d-%H%M%S")
  filenum = 0
  new_file_name = 'hashed_output_' + str(filenum) + '_' + cur_time + '.csv'
  new_csv = open(new_file_name, 'w')
  for line in csv_file:
    email = line[0]
    scrubbed_email = scrub(email)
    current_email_hashed = hash_string_256(scrubbed_email)
    new_csv.write(current_email_hashed + '\n')
    new_csv.flush()
    if os.stat(new_file_name).st_size >= BUF_SIZE:
      new_csv.close()
      print 'Finished writing to \"' + new_file_name + '\"'
      filenum += 1
      new_file_name = 'hashed_output_' + str(filenum) + '_' + cur_time + '.csv'
      new_csv = open(new_file_name, 'w')
      pass

new_csv.close()
  print 'Finished writing to \"' + new_file_name + '\"'
  pass

if __name__ == '__main__':
  main()

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