[Tutor] comparing lists, __lt__ and __gt__
Alan Gauld
alan.gauld at btinternet.com
Sun Jul 29 02:11:36 CEST 2007
"Sara Johnson" <sarliz73 at yahoo.com> wrote
> Thanks Alan. That said, any idea what it means in this context?
>
> for key in skeys:
> fracmiss=1.*numberMissing(z[key].values())/nsites #note
> decimal multiplication, 1.*
> outstring="%s has %4.1f%% missing" % (key,100*fracmiss)
> if fracmiss >>0
None whatsoever, it looks like an error to me!
That having been saisd their is another use for >> which is to append
output to a file, as in:
print 'hello world' >> myfile
sends the string to myfile instead of to stdout. (Although I couldn't
get this to
work when I tried it!)
Alan G.
----- Original Message ----
From: Alan Gauld <alan.gauld at btinternet.com>
To: tutor at python.org
Sent: Saturday, July 28, 2007 5:03:05 PM
Subject: Re: [Tutor] comparing lists, __lt__ and __gt__
"Sara Johnson" <sarliz73 at yahoo.com> wrote
> What if there is a '<<' or '>>'?
> Does that just mean the same thing (maybe a little over emphasized..
> ;)
The double chevron operator is for bit-shifting its not a camparison
operation.
So no operator override function exists.
> I thought I saw this when I was learning boolean expressions,
> but I don't recall.
Possibly, because its often used to manipulate bitpatterns in
conjunction with bitwise boolean comparisons (and/or/xor etc)
HTH,
--
Alan Gauld
Author of the Learn to Program web site
http://www.freenetpages.co.uk/hp/alan.gauld
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