[Tutor] help
help
--- On Sat, 3/14/09, tutor-requ...@python.org wrote:
> From: tutor-requ...@python.org
> Subject: Tutor Digest, Vol 61, Issue 50
> To: tutor@python.org
> Date: Saturday, March 14, 2009, 5:18 AM
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> Today's Topics:
>
>1. update list of dictionaries based on key (ski)
>2. Re: update list of dictionaries based on key (greg
> whittier)
>3. Re: update list of dictionaries based on key (ski)
>4. best gui for the job? (W W)
>5. Re: best gui for the job? (Lie Ryan)
>
>
> --
>
> Message: 1
> Date: Fri, 13 Mar 2009 16:09:58 +0100
> From: ski
> Subject: [Tutor] update list of dictionaries based on key
> To: python tutor
> Message-ID: <49ba7746.6090...@khine.net>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>
> Hello,
> Here is what I have so far:
>
> >>> mylist = [{'index': 0,
> 'title': 'Association of British Travel
> Agents', 'selected': False, 'edit_row':
> '?edit_affiliation=0',
> 'affiliation': 'ABTA',
> 'affiliation_no': u'G3903'},
> {'index': 1,
> 'title': 'Appointed Agents of IATA',
> 'selected': False, 'edit_row':
> '?edit_affiliation=1', 'affiliation':
> 'IATA', 'affiliation_no':
> u'none'}, {'index': 0, 'title':
> 'Association of Airline Cons.',
> 'selected': False, 'edit_row':
> '?edit_affiliation=0', 'affiliation':
> 'AAC', 'affiliation_no': u'sss'},
> {'index': 1, 'title': 'Association of
> British Travel Agents', 'selected': False,
> 'edit_row':
> '?edit_affiliation=1', 'affiliation':
> 'ABTA', 'affiliation_no': u'zser'}]
>
> >>> key = 'affiliation_no'
>
> >>> my_dup_keys = []
> >>> merged_list = []
>
> >>> mykeys = [item['affiliation'] for
> item in mylist]
>
> >>> for x in mykeys:
> if mykeys.count(x) >= 2:
> my_dup_keys.append(x)
>
> >>> for item in mylist:
> if item['affiliation'] in set(my_dup_keys):
> merged_list.append(item)
>
>
> >>> values = [d[key] for d in merged_list if
> d.has_key(key)]
> >>> for dict in merged_list:
> dict[key] = values
> mylist.append(dict)
>
> >>> print mylist
> [{'index': 0, 'title': 'Association of
> British Travel Agents',
> 'selected': False, 'edit_row':
> '?edit_affiliation=0', 'affiliation':
> 'ABTA', 'affiliation_no':
> [u'G3903', u'zser']}, {'index': 1,
> 'title':
> 'Appointed Agents of IATA', 'selected':
> False, 'edit_row':
> '?edit_affiliation=1', 'affiliation':
> 'IATA', 'affiliation_no':
> u'none'}, {'index': 0, 'title':
> 'Association of Airline Cons.',
> 'selected': False, 'edit_row':
> '?edit_affiliation=0', 'affiliation':
> 'AAC', 'affiliation_no': u'sss'},
> {'index': 1, 'title': 'Association of
> British Travel Agents', 'selected': False,
> 'edit_row':
> '?edit_affiliation=1', 'affiliation':
> 'ABTA', 'affiliation_no':
> [u'G3903', u'zser']}, {'index': 0,
> 'title': 'Association of British
> Travel Agents', 'selected': False,
> 'edit_row': '?edit_affiliation=0',
> 'affiliation': 'ABTA',
> 'affiliation_no': [u'G3903',
> u'zser']}, {'index':
> 1, 'title': 'Association of British Travel
> Agents', 'selected': False,
> 'edit_row': '?edit_affiliation=1',
> 'affiliation': 'ABTA',
> 'affiliation_no': [u'G3903',
> u'zser']}]
>
>
> This sort of works but I want to return a list that updates
> 'mylist' not
> append to it, so I will get:
>
> [{'index': 0, 'title': 'Association of
> British Travel Agents',
> 'selected': False, 'edit_row':
> '?edit_affiliation=0', 'affiliation':
> 'ABTA', 'affiliation_no':
> [u'G3903', u'zser']}, {'index': 1,
> 'title':
> 'Appointed Agents of IATA', 'selected':
> False, 'edit_row':
> '?edit_affiliation=1', 'affiliation':
> 'IATA', 'affiliation_no':
> u'none'}, {'index': 0, 'title':
> 'Association of Airline Cons.',
> 'selected': False, 'edit_row':
> '?edit_affiliation=0', 'affiliation':
> 'AAC', 'affiliation_no': u'sss'}]
>
>
> Thanks
>
> Norman
>
>
>
> --
>
> Message: 2
> Date: Fri, 13 Mar 2009 11:43:19 -0400
> From: greg whittier
> Subject: Re: [Tutor] update list of dictionaries based on
> key
> To: python tutor
> Message-ID:
>
> Content-Type: text/plain; charset=ISO-8859-1
>
> On Fri, Mar 13, 2009 at 11:09 AM, ski
> wrote:
> > Hello,
> > Here is what I have so far:
> >
> mylist = [{'index': 0,
> 'title': 'Association of British Travel
> Agents',
> 'selected': False,
> 'edit_row': '?edit_affiliation=0',
> 'affiliation': 'ABTA',
> 'affiliation_no':
> u'G3903'}, {'i
Re: [Tutor] Help with Recurring Function
Hi Alan. Thanks a lot. It worked > -- > > Message: 2 > Date: Sat, 26 Apr 2008 13:46:39 +0100 > From: "Alan Gauld" <[EMAIL PROTECTED]> > Subject: Re: [Tutor] Help with Recurring Function > To: tutor@python.org > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; format=flowed; > charset="iso-8859-1"; > reply-type=original > > > "Sanhita Mallick" <[EMAIL PROTECTED]> wrote > > > > being calculated correctly as checked by the > "print" > > statement. But when we do > > > > norm_ted = (2 * ted) / mag > > It might be an integer division issue. > > Try > > norm_ted = (2*ted) / float(mag) > > Just a thought... > > > -- > Alan Gauld > Author of the Learn to Program web site > http://www.freenetpages.co.uk/hp/alan.gauld > > ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
Re: [Tutor] Help with Recurring Function
Hi Kent.
sum_norm_ted is sum over each i, and all j. That is
why it is initialize to zero at the beginning of each
i loop.
The inner loop IS running - which I checked by all the
print statements. The value of "ted" and "mag" ARE
being calculated correctly as checked by the "print"
statement. But when we do
norm_ted = (2 * ted) / mag
becomes zero, and subsequently sum_norm_ted becomes
zero.
--- Kent Johnson <[EMAIL PROTECTED]> wrote:
> Sanhita Mallick wrote:
>
> > I am struggling with a simple recurring function
>
> What is a recurring function? Do you mean looping?
> >
> > Here is the script. T(i) are trees (as in graphs).
> > The program operates great, until the step where
> > norm_ted is calculated. Mysteriously norm_ted
> becomes
> > 0, even though "mag" value is calculated
> correctly.
> > Also, strangely, sum_norm_ted also becomes zero.
> >
> > What am I missing?
>
> Do you mean for sum_norm_ted to be the sum over all
> i and j? If so, you
> should initialize it before the start of the outer
> loop.
>
> I don't know why you are getting 0 at the end of the
> loop. It is as if
> sum_norm_ted and norm_ted are initialized but the
> inner loop doesn't
> run. Is this the exact code that you have trouble
> with?
>
> Kent
> >
> > Thanks.
> > -Sanhita
> >
> > ~~~
> > T = [F1, F2, F3]
> > k = len(T)
> > mean_ted = {}
> > for i in range(k):
> > sum_norm_ted = 0.0
> > mag = 0.0
> > norm_ted = 0.0
> > for j in range(k):
> > if (i != j):
> > ted= alg.ted(T[i], T[j])
> > print 'TED ' + str(i) + str(j) + ' is
> ' +
> > str(ted)
> > mag = 2 * (T[i].n + T[j].n) - 1
> > print 'MAG ' + str(i) + str(j) + ' is
> ' +
> > str (mag) + ' and ' + str ( 2 * ted )
> > norm_ted = (2 * ted) / mag
> > print 'norm_ted ' + str(i) + str(j) +
> ' is
> > ' + str (norm_ted)
> > sum_norm_ted = sum_norm_ted + norm_ted
> > print 'sum_norm_ted ' + str(i) +
> str(j) +
> > ' is ' + str (sum_norm_ted)
> > ___
> > Tutor maillist - Tutor@python.org
> > http://mail.python.org/mailman/listinfo/tutor
> >
>
>
___
Tutor maillist - Tutor@python.org
http://mail.python.org/mailman/listinfo/tutor
[Tutor] Help with Recurring Function
Hi.
I am struggling with a simple recurring function, but
can't understand why this is happening. Please help.
Here is the script. T(i) are trees (as in graphs).
The program operates great, until the step where
norm_ted is calculated. Mysteriously norm_ted becomes
0, even though "mag" value is calculated correctly.
Also, strangely, sum_norm_ted also becomes zero.
What am I missing?
Thanks.
-Sanhita
~~~
T = [F1, F2, F3]
k = len(T)
mean_ted = {}
for i in range(k):
sum_norm_ted = 0.0
mag = 0.0
norm_ted = 0.0
for j in range(k):
if (i != j):
ted= alg.ted(T[i], T[j])
print 'TED ' + str(i) + str(j) + ' is ' +
str(ted)
mag = 2 * (T[i].n + T[j].n) - 1
print 'MAG ' + str(i) + str(j) + ' is ' +
str (mag) + ' and ' + str ( 2 * ted )
norm_ted = (2 * ted) / mag
print 'norm_ted ' + str(i) + str(j) + ' is
' + str (norm_ted)
sum_norm_ted = sum_norm_ted + norm_ted
print 'sum_norm_ted ' + str(i) + str(j) +
' is ' + str (sum_norm_ted)
___
Tutor maillist - Tutor@python.org
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[Tutor] Arguments ina separate file
Hi. I have a big list of arguments, which I would like to keep in a separate file. How do I pass arguments that are in a separate file? Thanks. San ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
[Tutor] Graphs in Python
Hi. I am a newbie to Python. I am trying to implement a Python code for graph manipulation. My graphs are about 200-500 nodes big. Excepting for the short basic graph implementation info on Python.org, where can I find more in depth info about how to express graphs in python, and how to use them in a code? Also, does anyone know of a easy way of creating the dictionary for python for a 500-node graph, without typing each and every node? I found some application that recognize dot file Graphviz - but I am looking for a program that can let me "draw" a graph and then generate the lists automatically from the drawing. Thanks. -SM ___ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
