code: def get_next_line(self):
          
          try:
              line = next(self.random_file).strip()
              #keep track of which document we are currently looking at to later avoid having the same doc as t1
              if line == "":
                  self.current_random_doc = self.current_random_doc + 1
                  line = next(self.random_file).strip()
          except StopIteration:
              self.random_file.close()
              self.random_file = open(self.corpus_path, "r", encoding=self.encoding)
              line = next(self.random_file).strip()
          return line
docs: Gets next line of random_file and starts over when reaching end of file