mattia wrote:
Il Sat, 07 Mar 2009 00:05:53 -0200, Gabriel Genellina ha scritto:
En Fri, 06 Mar 2009 21:31:01 -0200, mattia <ger...@gmail.com> escribió:
Thanks, I've found another solution here:
http://www.obitko.com/tutorials/
genetic-algorithms/selection.php
so here is my implementation:
def get_fap(fitness, population):
fap = []
total = 0
for x in population:
f = fitness(x)
fap += [(f, x)]
total += f
return sorted(fap, reverse=True), total
Imagine you're working with someone side by side. You write a note in a
piece of paper, put it into an envelope, and hand it to your co-worker.
He opens the envelope, throws it away, takes the note and files it
inside a folder right at the end. And you do this over and over. What's
wrong in this story?
Please save our trees! Don't waste so many envelopes - that's just what
this line does:
fap += [(f, x)]
Environmentally friendly Pythoneers avoid using discardable intermediate
envelopes:
fap.append((f, x))
Please recycle!
Yes, sorry, I have to recycle! But how about this:
rw = [[2,4], [4,5,6],[5,5]]
rw += [[1,1]]*2
rw
[[2, 4], [4, 5, 6], [5, 5], [1, 1], [1, 1]]
rw = [[2,4], [4,5,6],[5,5]]
rw.append([1,1]*2)
rw
[[2, 4], [4, 5, 6], [5, 5], [1, 1, 1, 1]]
rw = [[2,4], [4,5,6],[5,5]]
rw.append([[1,1]]*2)
rw
[[2, 4], [4, 5, 6], [5, 5], [[1, 1], [1, 1]]]
How can I recicle in this way using append?
Not .append() but .extend()
>>> rw = [[2,4], [4,5,6],[5,5]]
>>> rw.extend([[1,1]]*2)
>>> rw
> [[2, 4], [4, 5, 6], [5, 5], [1, 1], [1, 1]]
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