Fixing mypy type annotation

      max_pair_distance == "infinity") or (isinstance(max_pair_distance, int)

                                           and max_pair_distance >= N):

    max_distance = N

  elif (isinstance(max_pair_distance, int) and max_pair_distance <= 0):

  elif (

      (isinstance(max_pair_distance, int) and max_pair_distance <= 0) or

      (isinstance(max_pair_distance, str) and max_pair_distance != "infinity")):

    raise ValueError(

        "max_pair_distance must either be a positive integer or the string 'infinity'"

    )

  else:

  elif isinstance(max_pair_distance, int):

    max_distance = max_pair_distance

  adj = rdmolops.GetAdjacencyMatrix(mol)

  # Handle edge case of self-pairs (i, i)