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Groups > comp.lang.python > #43013
| From | Dennis Lee Bieber <wlfraed@ix.netcom.com> |
|---|---|
| Subject | Re: Newbie to python. Very newbie question |
| Date | 2013-04-07 15:09 -0400 |
| Organization | > Bestiaria Support Staff < |
| References | <f0759987-4ff8-49a1-a826-4ae3f6508030@5g2000yqz.googlegroups.com> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.251.1365361814.3114.python-list@python.org> (permalink) |
On Sun, 7 Apr 2013 04:16:27 -0700 (PDT), ReviewBoard User
<lalitha.viswanath@gmail.com> declaimed the following in
gmane.comp.python.general:
> Hi
> I am a newbie to python and am trying to write a program that does a
> sum of squares of numbers whose squares are odd.
> For example, for x from 1 to 100, it generates 165 as an output (sum
> of 1,9,25,49,81)
>
> Here is the code I have
> print reduce(lambda x, y: x+y, filter(lambda x: x%2, map(lambda x:
> x*x, xrange
> (10**6)))) = sum(x*x for x in xrange(1, 10**6, 2))
>
> I am getting a syntax error.
> Can you let me know what the error is?
>
I can't even read that mess... three nested lambda?
Not the most efficient version but...
>>> sum( x*x for x in range(100/2) if (x*x % 2) and (x*x < 100) )
165
>
The range(100/2) is a simple reduction to avoid invoking a sqrt
function... the more economical is
>>> import math
>>> sum( x*x for x in range(int(math.sqrt(100))) if x*x % 2)
165
>>>
--
Wulfraed Dennis Lee Bieber AF6VN
wlfraed@ix.netcom.com HTTP://wlfraed.home.netcom.com/
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Newbie to python. Very newbie question ReviewBoard User <lalitha.viswanath@gmail.com> - 2013-04-07 04:16 -0700
Re: Newbie to python. Very newbie question Kruno Saho <kruno.saho@gmail.com> - 2013-04-07 04:19 -0700
Re: Newbie to python. Very newbie question Dave Angel <davea@davea.name> - 2013-04-07 07:50 -0400
Re: Newbie to python. Very newbie question rusi <rustompmody@gmail.com> - 2013-04-07 10:02 -0700
Re: Newbie to python. Very newbie question Miki Tebeka <miki.tebeka@gmail.com> - 2013-04-07 10:04 -0700
Re: Newbie to python. Very newbie question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-04-07 15:09 -0400
Re: Newbie to python. Very newbie question Miki Tebeka <miki.tebeka@gmail.com> - 2013-04-07 16:57 -0700
Re: Newbie to python. Very newbie question Ian Foote <ian@feete.org> - 2013-04-07 20:23 +0100
Re: Newbie to python. Very newbie question Arnaud Delobelle <arnodel@gmail.com> - 2013-04-07 21:16 +0100
Re: Newbie to python. Very newbie question Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-04-08 03:16 +0000
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