new_contents: from pymongo import MongoClient
  
  class BaseEdX(object):
  
      def __init__(self, args):
          self.url = args.url
          client = MongoClient(self.url)
          self.db = client[args.db_name]
          self.collections = None
          self.output_directory = args.output_directory
          self.row_limit = args.row_limit
          self.csv_data = None
          self.list_of_headers = None
  
subject: Define instance variables for base class