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

Groups > comp.lang.python > #99045

Re: Is there an meaning of '[[]]' in a list?

Path csiph.com!news.mixmin.net!npeer.de.kpn-eurorings.net!npeer-ng0.de.kpn-eurorings.net!fu-berlin.de!uni-berlin.de!not-for-mail
From Peter Otten <__peter__@web.de>
Newsgroups comp.lang.python
Subject Re: Is there an meaning of '[[]]' in a list?
Date Thu, 19 Nov 2015 12:40:17 +0100
Organization None
Lines 41
Message-ID <mailman.454.1447933236.16136.python-list@python.org> (permalink)
References <750e1071-395b-4e9b-ad64-05faa174a5bf@googlegroups.com>
Mime-Version 1.0
Content-Type text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding 7Bit
X-Trace news.uni-berlin.de JakreLKhCR+I09FqaH61XQzeWIRhKzUzg6ZGC734hGtQ==
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 0.003
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'assignment': 0.07; 'confuse': 0.09; 'level:': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; '[[]]': 0.16; 'commandline': 0.16; 'experiments': 0.16; 'hint:': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'received:t-ipconnect.de': 0.16; 'wrote:': 0.16; 'nested': 0.18; '>>>': 0.20; 'this:': 0.23; 'header:User-Agent:1': 0.26; 'subject:list': 0.26; 'header:X-Complaints-To:1': 0.26; 'question': 0.27; 'entries': 0.27; 'question:': 0.29; 'skip:i 60': 0.29; "i'm": 0.30; 'posts': 0.30; 'previous': 0.34; 'lists': 0.34; 'list': 0.34; 'list:': 0.35; 'there': 0.36; 'to:addr:python-list': 0.36; 'subject:?': 0.36; 'subject:: ': 0.37; 'received:org': 0.37; 'difference': 0.38; 'hi,': 0.38; 'sure': 0.39; 'to:addr:python.org': 0.40; 'received:de': 0.40; 'questions': 0.40; 'your': 0.60; 'between': 0.65; 'limit': 0.65; 'subject:there': 0.66; "'foo'": 0.84; 'experiment': 0.84
X-Injected-Via-Gmane http://gmane.org/
X-Gmane-NNTP-Posting-Host p57bd891b.dip0.t-ipconnect.de
User-Agent KNode/4.13.3
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.20+
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://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 <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Xref csiph.com comp.lang.python:99045

Show key headers only | View raw

fl wrote:

> Hi,
> In the previous exercises, I see list:
> cc=[[],[],[]]
> 
> Then, I can have this:
> 
> ccc=[[[]],[[]],[[]]]
> 
> I can also have
> 
> ccc[0]
> Out[158]: [[]]
> 
> ccc[0]='o'
> 
> ccc
> Out[163]: ['o', [[]], [[]]]
> 
> 
> I have question: Is there any difference between [[]] and []?
> [[]] can have deeper assignment and use than
> 
> ccc[0]='o'

I'm sure with a little effort and a few experiments on the commandline you 
can answer your question yourself. Please limit your posts to c.l.py to 
those questions that are a little harder.

Hint: when you experiment with nested lists use numbers, not strings as list 
entries that are not lists themselves. Strings can confuse you about the 
nesting level:

>>> items = ["foo"]
>>> items[0]
'foo'
>>> items[0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0][0]
'f'

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

Thread

Is there an meaning of '[[]]' in a list? fl <rxjwg98@gmail.com> - 2015-11-19 03:28 -0800
  Re: Is there an meaning of '[[]]' in a list? Nagy László Zsolt <gandalf@shopzeus.com> - 2015-11-19 12:36 +0100
  Re: Is there an meaning of '[[]]' in a list? Peter Otten <__peter__@web.de> - 2015-11-19 12:40 +0100
    Re: Is there an meaning of '[[]]' in a list? Quivis <quivis@domain.invalid> - 2015-11-22 23:25 +0000
      Re: Is there an meaning of '[[]]' in a list? Joel Goldstick <joel.goldstick@gmail.com> - 2015-11-22 19:08 -0500
      Re: Is there an meaning of '[[]]' in a list? Peter Otten <__peter__@web.de> - 2015-11-23 09:57 +0100
      Re: Is there an meaning of '[[]]' in a list? Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2015-11-25 12:04 +0100
  Re: Is there an meaning of '[[]]' in a list? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-11-19 16:26 +0000

csiph-web