code: def _read_tsv(cls, input_file, quotechar=None):
          
          with open(input_file, "r", encoding="utf-8") as f:
              reader = csv.reader(f, delimiter="\t", quotechar=quotechar)
              lines = []
              for line in reader:
                  if sys.version_info[0] == 2:
                      line = list(unicode(cell, 'utf-8') for cell in line)
                  lines.append(line)
              return lines
docs: Reads a tab separated value file.