[Tutor] Tutor Digest, Vol 47, Issue 64
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Thu Jan 24 17:23:09 CET 2008
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> Today's Topics:
>
> 1. Re: creating a nested dictionary (Remco Gerlich)
> 2. Re: Comparing more than 2 lists (Fiyawerx)
> 3. lst file (SwartMumba snake)
> 4. Re: lst file (Remco Gerlich)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 24 Jan 2008 10:51:39 +0100
> From: "Remco Gerlich" <remco at gerlich.nl>
> Subject: Re: [Tutor] creating a nested dictionary
> To: "Garry Willgoose" <garry.willgoose at newcastle.edu.au>
> Cc: tutor at python.org
> Message-ID:
> <7ae3ca10801240151q65731b8bhb36e8a8cebed7f7c at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Of course, I forgot to mention that you can use tuples as dictionary keys.
>
> A common idiom is:
>
> pdb[(dataset, modulename, parametername, 'value')] = value.
>
> And if that works for you, it's much simpler. But you lose the ability to
> use, say, pdb[dataset][modulename] as a dictionary on its own.
>
> Remco
>
>
> On Jan 24, 2008 8:20 AM, Garry Willgoose
> <garry.willgoose at newcastle.edu.au>
> wrote:
>
>> Is there any easy way to create a nested dictionary. I want to be
>> able to allocate like
>>
>> pdb[dataset][modulename][parametername]['value']=value
>>
>> where dataset, modulename, parametername are variables that are
>> determined within loops nested 3 deep, and value comes from a
>> database call. Prior to the nested loops I do not know what the
>> values of dataset, modulename, parametername will range over, but I
>> do know pdb needs to be nested 3 deep. What I'd like to do is
>> something like this
>>
>> pdb={}
>> for dataset in dataset_list:
>> modulename_list=getmodules(dataset)
>> for modulename in modulename_list:
>> parametername_list=getparameters(dataset,modulename)
>> for parametername in parametername_list:
>> value=getvalue(dataset, modulename,
>> parametername)
>>
>> pdb[dataset][modulename][parametername]['value']=value
>>
>> What I'm currently doing is
>>
>> pdb={}
>> for dataset in dataset_list:
>> modulename_list=getmodules(dataset)
>> moduledict={}
>> for modulename in modulename_list:
>> parametername_list=getparameters(dataset,modulename)
>> valuedict={}
>> for parametername in parametername_list:
>> value=getvalue(dataset, modulename,
>> parametername)
>> valuedict['value']=value
>> # valuedict needs to be a dictionary because there is other stuff
>> valuedict['otherstuff]=otherstuff
>> ...
>> parameterdict[parametername]=valuedict.copy()
>> moduledict[modeulename]=copy.deepcopy(parameterdict)
>> pdb[dataset]=copy.deepcopy(moduledict)
>>
>>
>> Now I know the 2nd is not that much more complex but this is a pretty
>> common construct in what I'm doing so I'm just wondering if there is
>> a clear and simple shortcut ;-)
>>
>>
>> ====================================================================
>> Prof Garry Willgoose,
>> Australian Professorial Fellow in Environmental Engineering,
>> Director, Centre for Climate Impact Management (C2IM),
>> School of Engineering, The University of Newcastle,
>> Callaghan, 2308
>> Australia.
>>
>> Centre webpage: www.c2im.org.au
>>
>> Phone: (International) +61 2 4921 6050 (Tues-Fri AM); +61 2 6545 9574
>> (Fri PM-Mon)
>> FAX: (International) +61 2 4921 6991 (Uni); +61 2 6545 9574 (personal
>> and Telluric)
>> Env. Engg. Secretary: (International) +61 2 4921 6042
>>
>> email: garry.willgoose at newcastle.edu.au;
>> g.willgoose at telluricresearch.com
>> email-for-life: garry.willgoose at alum.mit.edu
>> personal webpage: www.telluricresearch.com/garry
>> ====================================================================
>> "Do not go where the path may lead, go instead where there is no path
>> and leave a trail"
>> Ralph Waldo Emerson
>> ====================================================================
>>
>>
>>
>>
>>
>> _______________________________________________
>> Tutor maillist - Tutor at python.org
>> http://mail.python.org/mailman/listinfo/tutor
>>
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> ------------------------------
>
> Message: 2
> Date: Thu, 24 Jan 2008 05:37:46 -0500
> From: Fiyawerx <fiyawerx at gmail.com>
> Subject: Re: [Tutor] Comparing more than 2 lists
> To: "Michael Langford" <mlangford.cs03 at gtalumni.org>, tutor at python.org
> Message-ID:
> <1b31ae500801240237p1da76059wfe8931542352a549 at mail.gmail.com>
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>
> Thanks Michael, this worked great, time to read up on collections!
>
> On Jan 24, 2008 3:36 AM, Michael Langford <mlangford.cs03 at gtalumni.org>
> wrote:
>
>> You use a variation on bucket sort do to this:
>> http://en.wikipedia.org/wiki/Bucket_sort
>>
>> You make a dict where the keys are the values in the lists, and a name
>> for each list is in the problem.
>>
>> So you get something that looks like:
>>
>> one: list1, list2
>> two: list1, list2, list3
>> etc
>>
>> Doing this with collections.defaultdict is a breeze:
>> import collections
>>
>> dd = collections.defaultdict(list)
>> for eachlist in lists:
>> for each in eachlist:
>> dd[each].append(getListName(eachlist))
>>
>> Then to find the repeated elements you filter where the list is of
>> length
>> > 1.
>>
>> for each in dd:
>> print "%s: %s" % (each, dd[each])
>>
>> I'd provide code, but I'm not sure what an appropriate naming function
>> is for you, nor am I sure what you're doing with this when you're
>> done.
>>
>> --Michael
>>
>>
>>
>> On Jan 24, 2008 3:15 AM, Fiyawerx <fiyawerx at gmail.com> wrote:
>> > I have been able to find a few articles on comparing 2 lists, but I
>> have
>> 4
>> > lists that I need to compare. I need to find any repeated elements and
>> the
>> > list that they came from. For example,
>> >
>> > list1 = ['one', 'two', 'three']
>> > list2 = ['one', 'two', 'four', 'five']
>> > list3 = ['two', 'three', 'six', 'seven']
>> > list4 = ['three', 'five', 'six']
>> > https://mail.google.com/mail/#label/Pythontutor/117aadf8364dbf3b
>> Gmail - [Tutor] Comparing more than 2 lists - michael.langford at gmail.com
>> >
>> > I need to be able to get along the lines of output:
>> > Element 'one' contained in list1 and list2
>> > Element 'two' contained in list1 and list2 and list3
>> > ...
>> > Element 'five' contained in list2 and list4
>> >
>> > etc.. and I can't quite figure out how to go about it
>> >
>> >
>> > _______________________________________________
>> > Tutor maillist - Tutor at python.org
>> > http://mail.python.org/mailman/listinfo/tutor
>> >
>> >
>>
>>
>>
>> --
>> Michael Langford
>> Phone: 404-386-0495
>> Consulting: http://www.RowdyLabs.com
>>
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> ------------------------------
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> Message: 3
> Date: Thu, 24 Jan 2008 02:42:59 -0800 (PST)
> From: SwartMumba snake <swartmumba at yahoo.com>
> Subject: [Tutor] lst file
> To: tutor at python.org
> Message-ID: <136412.59532.qm at web44806.mail.sp1.yahoo.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi
>
> I am trying to read from a specific .lst file. When I read from it, it
> just prints out blank lines and I am sure that this file contains content.
>
> This is what I am using to read from the file:
>
> f = open("C:\\Users\\UserName\\Directory\\words.lst")
>
> for line in f:
> print line
>
> f.close()
>
> Do you guys know what is wrong?
>
> Thanks in advance.
>
>
> ---------------------------------
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> ------------------------------
>
> Message: 4
> Date: Thu, 24 Jan 2008 11:54:04 +0100
> From: "Remco Gerlich" <remco at gerlich.nl>
> Subject: Re: [Tutor] lst file
> To: "SwartMumba snake" <swartmumba at yahoo.com>
> Cc: tutor at python.org
> Message-ID:
> <7ae3ca10801240254rea22f00pb22303d89618e6f8 at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Many things could be wrong; perhaps with reading the file, or the lines,
> or
> with printing them... Debugging usually consists of what the problem is
> exactly, where it occurs.
>
> First thing I'd look at is seeing whether the lines do get read. I would
> change "print line" into "print len(line)" and see if the lines are empty,
> or filled with unprintable things.
>
> Also, what sort of file is it?
>
> Remco
>
>
> On Jan 24, 2008 11:42 AM, SwartMumba snake <swartmumba at yahoo.com> wrote:
>
>> Hi
>>
>> I am trying to read from a specific .lst file. When I read from it, it
>> just prints out blank lines and I am sure that this file contains
>> content.
>>
>> This is what I am using to read from the file:
>>
>> f = open("C:\\Users\\UserName\\Directory\\words.lst")
>>
>> for line in f:
>> print line
>>
>> f.close()
>>
>> Do you guys know what is wrong?
>>
>> Thanks in advance.
>>
>> ------------------------------
>> Never miss a thing. Make Yahoo your
>> homepage.<http://us.rd.yahoo.com/evt=51438/*http://www.yahoo.com/r/hs>
>>
>> _______________________________________________
>> Tutor maillist - Tutor at python.org
>> http://mail.python.org/mailman/listinfo/tutor
>>
>>
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