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Needing python experts to help with a problem

P: n/a
gms
Hello,
I have the following list:

[{'count': u'2', 'manu': <Manufacturer: Manu1>}, {'count': u'4',
'manu': <Manufacturer: Manu2>}, {'count': u'2', 'manu': <Manufacturer:
Manu3>}, {'count': u'2', 'manu': <Manufacturer: Manu2>}]

My current list currently contains four dictionaries. They are:

{'count': u'2', 'manu': <Manufacturer: Manu1>}
{'count': u'4', 'manu': <Manufacturer: Manu2>}
{'count': u'2', 'manu': <Manufacturer: Manu3>}
{'count': u'2', 'manu': <Manufacturer: Manu2>}

I need to create a list for each specific Manufacturer. Since I have
two dictionaries that have 'Manu2' as it's manufacturer. I will need
some code that will create the following from the list above:

[{'count': u'2', 'manu': <Manufacturer: Manu1>}]
[{'count': u'4', 'manu': <Manufacturer: Manu2>},{'count': u'2',
'manu': <Manufacturer: Manu2>}]
[{'count': u'2', 'manu': <Manufacturer: Manu3>}]

The reason for this is because I want to send one email to each
manufacturer. In this case I would send two emails to Manu2 because I
have two dictionaries that have Manu2 as the manufacturer. That is
why I need to create a separate list for each manufacturer.

Any help on on how best to do this would be greatly appreciated!

Thanks
Jun 27 '08 #1
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2 Replies


P: n/a
CM
On Jun 7, 12:51 am, gms <esug...@gmail.comwrote:
Hello,
I have the following list:

[{'count': u'2', 'manu': <Manufacturer: Manu1>}, {'count': u'4',
'manu': <Manufacturer: Manu2>}, {'count': u'2', 'manu': <Manufacturer:
Manu3>}, {'count': u'2', 'manu': <Manufacturer: Manu2>}]

My current list currently contains four dictionaries. They are:

{'count': u'2', 'manu': <Manufacturer: Manu1>}
{'count': u'4', 'manu': <Manufacturer: Manu2>}
{'count': u'2', 'manu': <Manufacturer: Manu3>}
{'count': u'2', 'manu': <Manufacturer: Manu2>}

I need to create a list for each specific Manufacturer. Since I have
two dictionaries that have 'Manu2' as it's manufacturer. I will need
some code that will create the following from the list above:

[{'count': u'2', 'manu': <Manufacturer: Manu1>}]
[{'count': u'4', 'manu': <Manufacturer: Manu2>},{'count': u'2',
'manu': <Manufacturer: Manu2>}]
[{'count': u'2', 'manu': <Manufacturer: Manu3>}]

The reason for this is because I want to send one email to each
manufacturer. In this case I would send two emails to Manu2 because I
have two dictionaries that have Manu2 as the manufacturer. That is
why I need to create a separate list for each manufacturer.

Any help on on how best to do this would be greatly appreciated!

Thanks
I'm not expert, but it just seems that this structure is overly
complex. What is your goal, and what information do you want to
associate with each manufacturer? Couldn't you simplify this
this section:
{'count': u'2', 'manu': <Manufacturer: Manu1>}
{'count': u'4', 'manu': <Manufacturer: Manu2>}
{'count': u'2', 'manu': <Manufacturer: Manu3>}
{'count': u'2', 'manu': <Manufacturer: Manu2>}
to something like:

manu_dict = { Manu1:[2], Manu2:[4,2], Manu3:[2] }

Jun 27 '08 #2

P: n/a
CM wrote:
On Jun 7, 12:51 am, gms <esug...@gmail.comwrote:
>Hello,
I have the following list:

[{'count': u'2', 'manu': <Manufacturer: Manu1>}, {'count': u'4',
'manu': <Manufacturer: Manu2>}, {'count': u'2', 'manu': <Manufacturer:
Manu3>}, {'count': u'2', 'manu': <Manufacturer: Manu2>}]
....

This sounds like a homework assignment. If you're having trouble
with this, sending mail from Python is really going to be a headache
for you.

You want something like

inlist = [{'count': u'2', 'manu': <Manufacturer: Manu1>}, {'count': u'4',
'manu': <Manufacturer: Manu2>}, {'count': u'2', 'manu': <Manufacturer:
Manu3>}, {'count': u'2', 'manu': <Manufacturer: Manu2>}]
outdict = {}
for mandict in inlist :
if not outdict.has_key(mandict[manu]) # if first for this manu
outdict[mandict[manu]] = [] # make empty list
outdict[mandict[manu]].append(mandict) # append entry to list

You now have the desired result in a dictionary, which you can convert to a list
if you like.

If it's a production job, and the number of manufacturers is large,
you're probably better off using a database like MySQL, or some
mail merge program.

John Nagle
Jun 27 '08 #3

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