Hung Jung Lu wrote:
... expand = lambda t: reduce(lambda r, s: [x+y for x in r
> for y in alphabet[s]], t, [''])
print expand('ATSGS')
Or, for a more verbose version:
multis = dict(W='AT', M='AC', R='AG', Y='TC', K='TG', S='CG',
H='ATC', D='ATG', V='AGC', B='CTG', N='ATCG')
def expanded(string, expansions=multis):
result = ''
for pos, char in enumerate(string):
if char in multis:
break
else:
yield string
raise StopIteration
parts = multis[char]
prelude, string = string[:pos], string[pos+1:]
for expansion in expanded(string, multis):
for middle in parts:
yield prelude + middle + expansion
--Scott David Daniels
[EMAIL PROTECTED]
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