But in my dictionary both keys and values are unique.
On Jul 14, 7:34 am, Dennis Lee Bieber [EMAIL PROTECTED] wrote:
On Sun, 13 Jul 2008 16:21:11 -0700 (PDT), Kless
[EMAIL PROTECTED] declaimed the following in comp.lang.python:
I need a dictionary where get the result from a 'key' (on left),
Dennis Lee Bieber wrote:
On Sun, 13 Jul 2008 16:21:11 -0700 (PDT), Kless
[EMAIL PROTECTED] declaimed the following in comp.lang.python:
I need a dictionary where get the result from a 'key' (on left), but
also from a 'value' (on right), how to get it?
I know that dictionaries aren't
Larry Bates:
The only case where it would be faster would be if most of the keys were NOT
in
the dictionary (rather odd use case). Otherwise I believe you will find the
first way quicker as the exceptions are infrequent.
I have written a small benchmark:
from random import shuffle
def
Akathorn Greyhat sent me by email the next solution, which althought
isn't generic it works well:
-
You could make your own class for that, maybe something like
#
class MyCoolDictionary(dict):
def __init__(self, *args, **kargs):
dict.__init__(self, *args,
If keys and values are unique you could do this...
--
# Left : Right
roman = { One : I,
Two : II,
Three : III,
Four: IV,
Five: V,
Six : VI,
Seven : VII,
Eight : VIII,
This is a better version of the class that I sen't you, now it raises a
KeyError when you try to insert a value that is already in
class MyCoolDictionary(dict):
def __init__(self, *args, **kargs):
dict.__init__(self, *args, **kargs)
def
If keys and values are unique, maybe just store both in the same
dictionary:
mydict[a] = b
mydict[b] = a
...
Gerry
On Jul 14, 8:31 am, Impotent Verse [EMAIL PROTECTED] wrote:
If keys and values are unique you could do this...
--
# Left : Right
roman =
I need a dictionary where get the result from a 'key' (on left), but
also from a 'value' (on right), how to get it?
I know that dictionaries aren't bidirectional, but is there any way
without use two dictionaries?
Thanks in advance!
--
http://mail.python.org/mailman/listinfo/python-list
On Jul 13, 4:21 pm, Kless [EMAIL PROTECTED] wrote:
I need a dictionary where get the result from a 'key' (on left), but
also from a 'value' (on right), how to get it?
I know that dictionaries aren't bidirectional, but is there any way
without use two dictionaries?
Thanks in advance!
You
On Jul 13, 4:21 pm, Kless [EMAIL PROTECTED] wrote:
I need a dictionary where get the result from a 'key' (on left), but
also from a 'value' (on right), how to get it?
I know that dictionaries aren't bidirectional, but is there any way
without use two dictionaries?
Thanks in advance!
You
bukzor:
You need to use two dictionaries. Here's a class that someone's
written that wraps it up into a single dict-like object for you:
http://www.faqts.com/knowledge_base/view.phtml/aid/4376
It contains code like:
try:
del self.data[item]
except KeyError:
pass
Exceptions are useful
[EMAIL PROTECTED] wrote:
bukzor:
You need to use two dictionaries. Here's a class that someone's
written that wraps it up into a single dict-like object for you:
http://www.faqts.com/knowledge_base/view.phtml/aid/4376
It contains code like:
try:
del self.data[item]
except KeyError:
-- Forwarded message --
From: Akathorn Greyhat [EMAIL PROTECTED]
Date: 2008/7/14
Subject: Re: Dictionary bidirectional
To: Kless [EMAIL PROTECTED]
2008/7/14 Kless [EMAIL PROTECTED]:
I need a dictionary where get the result from a 'key' (on left), but
also from a 'value
On Jul 13, 6:53 pm, Larry Bates [EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
bukzor:
You need to use two dictionaries. Here's a class that someone's
written that wraps it up into a single dict-like object for you:
http://www.faqts.com/knowledge_base/view.phtml/aid/4376
It contains
14 matches
Mail list logo
