On 7/23/2013 5:52 PM, st...@divillo.com wrote:
I think that itertools may be able to do what I want but I have not
been able to figure out how.
A recursive generator suffices.
I want to convert an arbitrary number of lists with an arbitrary
number of elements in each list into a single list as follows.
Say I have three lists:
[[A0,A1,A2], [B0,B1,B2] [C0,C1,C2]]
I would like to convert those to a single list that looks like this:
[A0,B0,C0,C1,C2,B1,C0,C1,C2,B2,C0,C1,C2,
> A1,B0,C0,C1,C2,B1,C0,C1,C2,B2,C0,C1,C2,
> A2,B0,C0,C1,C2,B1,C0,C1,C2,B2,C0,C1,C2]
def crossflat(lofl):
if lofl:
first = lofl.pop(0)
for o in first:
yield o
yield from crossflat(lofl.copy())
A0, A1, A2 = 100, 101, 102
B0, B1, B2 = 10, 11, 12
C0, C1, C2 = 0, 1, 2
LL = [[A0, A1, A2], [B0, B1, B2], [C0, C1, C2]]
cfLL = list(crossflat(LL))
print(cfLL)
assert cfLL == [
A0, B0, C0, C1, C2, B1, C0, C1, C2, B2, C0, C1, C2,
A1, B0, C0, C1, C2, B1, C0, C1, C2, B2, C0, C1, C2,
A2, B0, C0, C1, C2, B1, C0, C1, C2, B2, C0, C1, C2]
passes
--
Terry Jan Reedy
--
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