On Tue, 12 Jul 2005 11:52:41 -0400, Tim Peters <[EMAIL PROTECTED]> wrote:
>[Peter Hansen]
>...
>> I suppose I shouldn't blame setdefault() itself for being poorly named,
>
>No, you should blame Guido for that .
>
>> but it's confusing to me each time I see it in the above, because the
>> name does
[Peter Hansen]
...
> I suppose I shouldn't blame setdefault() itself for being poorly named,
No, you should blame Guido for that .
> but it's confusing to me each time I see it in the above, because the
> name doesn't emphasize that the value is being returned, and yet that
> fact is arguably mor
Oops.. Gmail just normally puts the reply to at the bottom of the
discussion... so by default I reply to the list, and the last person
to post. My comment was not directed at you. I just posted the
contents of an interactive session that I did to better understand
setdefault myself. I've got to
(Fixed top-posting)
James Carroll wrote:
> On 7/11/05, Peter Hansen <[EMAIL PROTECTED]> wrote:
>>(I always have to ignore the name to think about how it works, or it
>>gets in the way of my understanding it. The name makes fairly little
>>sense to me.)
> Notice the dictionary is only changed
Notice the dictionary is only changed if the key was missing.
>>> a = {}
>>> a.setdefault("a", "1")
'1'
>>> a.setdefault("a", "2")
'1'
>>> a.setdefault("b", "3")
'3'
>>> a
{'a': '1', 'b': '3'}
>>> a.setdefault("a", "5")
'1'
>>> a
{'a': '1', 'b': '3'}
-Jim
On 7/11/05, Peter Hansen <[EMAIL PROTECT
Ric Da Force wrote:
> How does setdefault work exactly? I am looking in the docs and can't figure
> it out...
If the key (the first argument) already exists in the dictionary, the
corresponding value is returned. If the key does not exist in the
dictionary, it is stored in the dictionary and b
How does setdefault work exactly? I am looking in the docs and can't figure
it out...
Ric
"Ric Da Force" <[EMAIL PROTECTED]> wrote in message
news:[EMAIL PROTECTED]
> Thank you guys! (Reinhold, Mark and Markus) I must confess that I am
> absolutely awe struck at the power of this language! Th
Thank you guys! (Reinhold, Mark and Markus) I must confess that I am
absolutely awe struck at the power of this language! There is no way in the
world that I would have envisaged such simple and elegant solutions!!!
Reinhold, is your solution specific to 2.4?
Kind Regards,
Ric
"Reinhold Bir
Mark Jackson wrote:
> "Ric Da Force" <[EMAIL PROTECTED]> writes:
>
>> It is hard to explain but this is what I mean:
>>
>> Dict = {'rt': 'This is repeated', 'sr': 'This is repeated', 'gf': 'This is
>> not'}
>>
>> I want this to return a new dict with string keys and lists containing the
>> pre
"Ric Da Force" <[EMAIL PROTECTED]> writes:
> It is hard to explain but this is what I mean:
>
> Dict = {'rt': 'This is repeated', 'sr': 'This is repeated', 'gf': 'This is
> not'}
>
> I want this to return a new dict with string keys and lists containing the
> previous keys for repeated values.
Hum... I think an iteritems is better, this way, python don't need to create in memory
a complete list of couple key, value.On 7/11/05, Markus Weihs <[EMAIL PROTECTED]> wrote:
Hi! Dict = {'rt': 'repeated', 'sr':'repeated', 'gf':'not repeated'} NewDic = {} for k,v in Dict.items(): NewDic.setdef
Hi!
Dict = {'rt': 'repeated', 'sr':'repeated', 'gf':'not repeated'}
NewDic = {}
for k,v in Dict.items():
NewDic.setdefault(v, []).append(k)
Regards, mawe
--
http://mail.python.org/mailman/listinfo/python-list
Hello,
Try that, it may not be the better solution, but it seems to work:
#def invertDict(d):
# d2 = {}
# for k, v in d.iteritems():
# d2.setdefault(v, []).append(k)
# return d2
Cyril
On 7/11/05, Ric Da Force <[EMAIL PROTECTED]> wrote:
Hi all,I have a dictionary containing about
Hi all,
I have a dictionary containing about 300 items, some of the values being
repeated. Both keys and values are strings. How can I turn this thing on
its head so that we create a key based on each unique value and build the
values based on the keys corresponding to the repeated values?
I
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