Typed Sequences

>>> nseq = Seq.Seq("ATCG", IUPAC.unambiguous_dna)
>>> wierd = seq + nseq
Traceback (most recent call last):
  File "", line 1, in ?
  File "/home/dalke/cvses/biopython/Bio/Seq.py", line 44, in __add__
    raise TypeError, ("incompatable alphabets", str(self.alphabet),
TypeError: ('incompatable alphabets', 'IUPACProtein()',
'IUPACUnambiguousDNA()')
>>>
 
.