Path: csiph.com!usenet.pasdenom.info!news.etla.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Date: Wed, 17 Apr 2013 12:25:37 +0200
From: aaB <mecagonoisician@gmail.com>
To: python-list@python.org
Subject: Re: a couple of things I don't understand wrt lists
Mail-Followup-To: python-list@python.org
References: <20130416153701.GA18377@gmail.com> <CAPTjJmqRB0eiG9peDOU+Ow_1rqq2u=xXcUduyxUm3gAhrzMjHg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CAPTjJmqRB0eiG9peDOU+Ow_1rqq2u=xXcUduyxUm3gAhrzMjHg@mail.gmail.com>
User-Agent: Mutt/1.5.21 (2010-09-15)
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.719.1366194346.3114.python-list@python.org>
Lines: 49
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:43752

Hello,

Thanks for all your replies, things are getting clearer.


- copy/paste vs retyping:
Several people have remarked that I had retyped instead of copy/pasting.
This is exactly what happened, the fact is I haven't figured out yet how to
enable copy/pasting from urxvt to vim.
I'll try to get this done before posting output from an interactive session.


- iterating a list:
If I understand what you've told me,

bitpattern = [1, 0, 0, 1, 1, 0, 1]
for bit in bitpattern: 
  print bit

and 

bitpattern = [1, 0, 0, 1, 1, 0, 1]
for i in range(len(bitpattern)): 
  print bitpattern[i]

are equivalent, the former being more "python" and the latter being something
like C written using python syntax.


- the "complement" thing:
I haven't yet tried to reproduce this, but I will, and I will post back if I see
this happening again, this time with a real log of python's interactive console,
or a complete script which people can use.


- list comprehension:
I wasn't at all aware of this, thanks a lot for pointing it out.
I had an other function that generated a list of cells for the CA, each cell
being randomly alive or dead.
I have rewritten it using list comprehension,

def populate(n):
  random.seed()
  return [random.randint(0,1) for i in range(n)]

which works the same as my previous, C-like, version but feels much better.

I might come back to you all but you've already given me a good push forward, so
I guess I'll be trying to use it as much as I can before asking for an other.