code: def padded_to_same_length(seq1, seq2, item=0):
      
      len1, len2 = len(seq1), len(seq2)
      if len1 == len2:
          return (seq1, seq2)
      elif len1 < len2:
          return (cons.ed(seq1, yield_n(len2-len1, item)), seq2)
      else:
          return (seq1, cons.ed(seq2, yield_n(len1-len2, item)))
docs: Return a pair of sequences of the same length by padding the shorter 
      sequence with ``item``.
  
      The padded sequence is a tuple. The unpadded sequence is returned as-is.