[Tutor] help
help
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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 nor...@khine.net
Subject: [Tutor] update list of dictionaries based on key
To: python tutor tutor@python.org
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 g...@thewhittiers.com
Subject: Re: [Tutor] update list of dictionaries based on
key
To: python tutor tutor@python.org
Message-ID:
a250eacf0903130843o6aed2c3bk1893a20feed0c...@mail.gmail.com
Content-Type: text/plain; charset=ISO-8859-1
On Fri, Mar 13, 2009 at 11:09 AM, ski
nor...@khine.net 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'}, {'index': 1, 'title':
'Appointed
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)
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[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)
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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
