On Tue, 17 Aug 2010 09:12:39 am Huy Ton That wrote:
> What do you mean by subclass?
It's a fundamental term from object-oriented programming.
If you have a class that defines certain data and behaviour, you can
create a *subclass* that inherits the same data and behaviour, except
for specific e
On 8/16/2010 4:12 PM Huy Ton That said...
What do you mean by subclass?
If you need repeated access such that iterating over a large dict frequently
impacts performance, you could subclass dict and maintain a second index
allowing instant access to the keys associated with a specific value.
On Tue, 17 Aug 2010 03:44:33 am Chorn, Guillaume wrote:
> Hi All,
>
> I know that I can look up the value for a particular key in a
> dictionary, but can I look up the key associated with a particular
> value? I understand that this could be problematic from the
> standpoint of multiple keys havin
all key-value pairings were unique...
-Original Message-
From: Dave Angel [mailto:da...@ieee.org]
Sent: Monday, August 16, 2010 4:03 PM
To: Chorn, Guillaume
Cc: tutor@python.org
Subject: Re: [Tutor] Question about Dictionaries
Chorn, Guillaume wrote:
> Hi All,
>
> I know that I ca
"Chorn, Guillaume" wrote
dictionary, but can I look up the key associated with a particular
value?
Not directly but its not hard to do bearing in mind you will
get a collection back.:
d = {1:10,2:20,3:10,4:20}
val = 10
ks = [k for k in d if d[k] == val]
ks
[1, 3]
You need to trawl
What do you mean by subclass?
On Aug 16, 2010 3:26 PM, "Emile van Sebille" wrote:
On 8/16/2010 10:44 AM Chorn, Guillaume said...
>
> Hi All,
>
> I know that I can look up the value for a particular key in a
> dictionary, but can...
Yes. But you'll need to implement it. There are likely modul
Chorn, Guillaume wrote:
Hi All,
I know that I can look up the value for a particular key in a
dictionary, but can I look up the key associated with a particular
value? I understand that this could be problematic from the standpoint
of multiple keys having the same value, but even then I feel li
> I know that I can look up the value for a particular key in a
> dictionary, but can I look up the key associated with a particular
> value?
I am using bidict in one of my projects:
http://pypi.python.org/pypi/bidict/0.1.1
It's probably a bit more complex than what I
need, but the parts I am u
On 8/16/2010 10:44 AM Chorn, Guillaume said...
Hi All,
I know that I can look up the value for a particular key in a
dictionary, but can I look up the key associated with a particular
value?
Yes. But you'll need to implement it. There are likely modules out
there that'll do this, but it'd t
Hi All,
I know that I can look up the value for a particular key in a
dictionary, but can I look up the key associated with a particular
value? I understand that this could be problematic from the standpoint
of multiple keys having the same value, but even then I feel like Python
could just retur
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