Generating a random subsequence
Tom Bryan
tbryan at python.net
Tue Jan 8 23:30:42 EST 2002
Alex Martelli wrote:
> can become:
> templist = list(seq)
> random.shuffle(templist)
> for item in templist[:length]:
> returnSeq += item
>
> The += augmented operator dispatches appropriately to in-place or
> not-in-place mutation depending on LHO's mutable/immutable nature.
Is that just true of +=?
That is, if returnSeq is a list then, I can say
returnSeq = returnSeq + item
OR
returnSeq.append( item )
OR
returnSeq += item
You're saying that the last one is roughly equivalent to the second one and
not the first? Or are they all three equivalent?
the-last-time-I-used-python-there-wasn't-a-+=-ly,
---Tom
More information about the Python-list
mailing list