docs: def int_to_base36(i):
      """
      Django on py2 raises ValueError on large values.
      """
      if six.PY2:
          char_set = '0123456789abcdefghijklmnopqrstuvwxyz'
          if i < 0:
              raise ValueError("Negative base36 conversion input.")
          if not isinstance(i, six.integer_types):
              raise TypeError("Non-integer base36 conversion input.")
          if i < 36:
              return char_set[i]
          b36 = ''
          while i != 0:
              i, n = divmod(i, 36)
              b36 = char_set[n] + b36
      else:
          from django.utils.http import int_to_base36
          b36 = int_to_base36(i)
      return b36