NEWBIE: map | zip | list comp
MetalOne
jcb at iteris.com
Sat Jan 3 23:06:58 CET 2004
The following produces the same result but in a 2 dimensional list.
However, it is darn near impossible to read.
print map(lambda x:
map(lambda (c1,c2):
map(lambda ix: (c1*length)[:ix]+c2+(c1*length)[ix:-1], range(length)),
filter(lambda (c,d): c!=d, map(lambda y: (x,y), base_seq))), base_seq)
for base_seq = "ABCD"
The (x,y) pairs produced are
(A,A), (A,B), (A,C), (A,D),
(B,A), (B,B), (B,C), (B,D), ...
The filter removes the duplicate pairs (A,A),(B,B),(C,C),(D,D)
for (c1,c2) in [(A,B), (A,C), (A,D)] the rotation function gets applied.
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