Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #43013

Re: Newbie to python. Very newbie question

Path csiph.com!usenet.pasdenom.info!news.etla.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <python-python-list@m.gmane.org>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.004
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'syntax': 0.04; 'newbie': 0.05; 'output': 0.05; 'nested': 0.07; 'squares': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:question': 0.10; 'python': 0.11; 'invoking': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'subject:python.': 0.16; 'xrange': 0.16; 'trying': 0.19; '>>>': 0.22; 'import': 0.22; 'print': 0.22; 'error': 0.23; 'url:home': 0.24; 'math': 0.24; 'header:X-Complaints-To:1': 0.27; 'is?': 0.30; 'code': 0.31; 'getting': 0.31; "can't": 0.35; 'version': 0.36; 'charset:us-ascii': 0.36; 'error.': 0.37; 'example,': 0.37; 'received:76': 0.38; 'to:addr:python-list': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'even': 0.60; 'read': 0.60; 'most': 0.60; 'numbers': 0.61; 'simple': 0.61; 'sum': 0.64; 'more': 0.64; 'here': 0.66; 'subject:. ': 0.67; '165': 0.84; 'subject:Very': 0.84; '2013': 0.98
X-Injected-Via-Gmane http://gmane.org/
To python-list@python.org
From Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject Re: Newbie to python. Very newbie question
Date Sun, 07 Apr 2013 15:09:58 -0400
Organization > Bestiaria Support Staff <
References <f0759987-4ff8-49a1-a826-4ae3f6508030@5g2000yqz.googlegroups.com>
Mime-Version 1.0
Content-Type text/plain; charset=us-ascii
Content-Transfer-Encoding 7bit
X-Gmane-NNTP-Posting-Host adsl-76-253-106-230.dsl.klmzmi.sbcglobal.net
X-Newsreader Forte Agent 3.3/32.846
X-No-Archive YES
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.251.1365361814.3114.python-list@python.org> (permalink)
Lines 37
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1365361814 news.xs4all.nl 6841 [2001:888:2000:d::a6]:51255
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:43013

Show key headers only | View raw

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/

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

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

csiph-web