Mailing List Archive

Chris Frost writes:
> I have two lists and would like to merge them into a dictionary, with one
> list forming the keywords and the other the values in the dictionary. How could
> this be done? "map(None, keyword_list, value_list)" looked great, but it
> returns a list of pairs (I'd like to be able to specify values according to
> keywords...).

Unless I'm missing the point (which happens more than I'd like to
admit!) I think what you're looking for is just:

dicp={}
for key,value in map(None,key_list,value_list):
dict[key]=value

-->"Chris" == Chris Frost <chris@frostnet.advicom.net> writes:

Chris> I have two lists and would like to merge them into a
Chris> dictionary, with one list forming the keywords and the other
Chris> the values in the dictionary. How c= ould this be done?
Chris> "map(None, keyword_list, value_list)" looked great, but it
Chris> returns a list of pairs (I'd like to be able to specify
Chris> values according to keywords...).

it's ugly, but ...

reduce(lambda d,i,setitem=operator.__setitem__: setitem(d,i[0],i[1]) or d, map(None, keyword_list, value_list), {})




d

From: David Arnold <arnold@dstc.edu.au>
Subject: Re: Merging two lists as a dictionary
Organization: CWI, Amsterdam

-->"Chris" == Chris Frost <chris@frostnet.advicom.net> writes:

Chris> I have two lists and would like to merge them into a
Chris> dictionary, with one list forming the keywords and the other
Chris> the values in the dictionary. How c= ould this be done?
Chris> "map(None, keyword_list, value_list)" looked great, but it
Chris> returns a list of pairs (I'd like to be able to specify
Chris> values according to keywords...).

it's ugly, but ...

reduce(lambda d,i,setitem=operator.__setitem__: setitem(d,i[0],i[1]) or d,
map(None, keyword_list, value_list), {})




d
--
|Fidonet: UUCP 2:500/3.1
|Internet: UUCP@p1.f3.n500.z2.hccfido.hcc.nl
|
| Standard disclaimer: The views of this user are strictly his own.

Hi All--

Chris Frost wrote:
>
> I have two lists and would like to merge them into a dictionary, with one
> list forming the keywords and the other the values in the dictionary. How could
> this be done? "map(None, keyword_list, value_list)" looked great, but it
> returns a list of pairs (I'd like to be able to specify values according to
> keywords...).
>
> thanks for any pointers!

Here's a simplistic implementation:
----------------------------------------------
#!/usr/local/bin/python

k = ["one","two","three"]
v = [1,2,3]
d = {}

n = 0
for i in k:
d[i] = v[n]
n = n + 1

print "Keys:", k
print "Values:", v
print "Dictionary:", d
----------------------------------------------

Alternatively, you could take the list of pairs (tuples) you get back
from map() and iterate over that:

for i in pairs:
dict[i[0]] = i[1]

<you're-in-trouble-if-the-lists-aren't-the-same-length>-ly y'rs,
Ivan
----------------------------------------------
Ivan Van Laningham
Callware Technologies, Inc.
ivanlan@callware.com
ivanlan@home.com
http://www.pauahtun.org
See also:
http://www.foretec.com/python/workshops/1998-11/proceedings.html
Army Signal Corps: Cu Chi, Class of '70
----------------------------------------------

From: Ivan Van Laningham <ivanlan@callware.com>
Subject: Re: Merging two lists as a dictionary
Organization: Callware Technologies, Inc.

Hi All--

Chris Frost wrote:
>
> I have two lists and would like to merge them into a dictionary, with one
> list forming the keywords and the other the values in the dictionary. How
could
> this be done? "map(None, keyword_list, value_list)" looked great, but it
> returns a list of pairs (I'd like to be able to specify values according to
> keywords...).
>
> thanks for any pointers!

Here's a simplistic implementation:
----------------------------------------------
#!/usr/local/bin/python

k = ["one","two","three"]
v = [1,2,3]
d = {}

n = 0
for i in k:
d[i] = v[n]
n = n + 1

print "Keys:", k
print "Values:", v
print "Dictionary:", d
----------------------------------------------

Alternatively, you could take the list of pairs (tuples) you get back
from map() and iterate over that:

for i in pairs:
dict[i[0]] = i[1]

<you're-in-trouble-if-the-lists-aren't-the-same-length>-ly y'rs,
Ivan
----------------------------------------------
Ivan Van Laningham
Callware Technologies, Inc.
ivanlan@callware.com
ivanlan@home.com
http://www.pauahtun.org
See also:
http://www.foretec.com/python/workshops/1998-11/proceedings.html
Army Signal Corps: Cu Chi, Class of '70
----------------------------------------------
--
|Fidonet: UUCP 2:500/3.1
|Internet: UUCP@p1.f3.n500.z2.hccfido.hcc.nl
|
| Standard disclaimer: The views of this user are strictly his own.

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On Tue, Jul 20, 1999 at 10:13:16PM -0500, Charles G Waldman wrote:
> Unless I'm missing the point (which happens more than I'd like to
> admit!) I think what you're looking for is just:
>=20
> dicp=3D{}
> for key,value in map(None,key_list,value_list):
> dict[key]=3Dvalue
Perfect! (I wasn't sure on how to do the last line...)

thanks,
--=20
Chris Frost | <http://www.frostnet.advicom.net/chris/>
-------------+------------------------------------------
Public PGP Key:
Email chris@frostnet.advicom.net with the subject "retrieve pgp key"
or visit <http://www.frostnet.advicom.net/chris/about/pgp_key.phtml>

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--WYTEVAkct0FjGQmd--

On Wed, Jul 21, 1999 at 02:19:46AM +0000, Chris Frost wrote:

> I have two lists and would like to merge them into a dictionary, with one
> list forming the keywords and the other the values in the dictionary. How could
> this be done? "map(None, keyword_list, value_list)" looked great, but it
> returns a list of pairs (I'd like to be able to specify values according to
> keywords...).

>>> keywords = ['s','p','a','m']
>>> values = ['eggs', 'ham', 'toast', 'omelet']
>>> result = {}
>>> for i in range(min(len(keywords), len(values))):
... result[keywords[i]] = values[i]
...
>>> result
{'m': 'omelet', 's': 'eggs', 'p': 'ham', 'a': 'toast'}

the 'min()' is unecessary if you are 100% certain the lists are same length,
or if you know which list will be the shorter one. (iter over the shortest
one, in that case)

--
Thomas Wouters <thomas@xs4all.net>

Hi! I'm a .signature virus! copy me into your .signature file to help me spread!

--Fig2xvG2VGoz8o/s
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: quoted-printable

On Wed, Jul 21, 1999 at 03:35:39PM +0200, Thomas Wouters wrote:
> >>> keywords =3D ['s','p','a','m'] =20
> >>> values =3D ['eggs', 'ham', 'toast', 'omelet']
> >>> result =3D {}
> >>> for i in range(min(len(keywords), len(values))):
> ... result[keywords[i]] =3D values[i]
> ...=20
> >>> result
> {'m': 'omelet', 's': 'eggs', 'p': 'ham', 'a': 'toast'}
>=20
> the 'min()' is unecessary if you are 100% certain the lists are same leng=
th,
> or if you know which list will be the shorter one. (iter over the shortest
> one, in that case)
Great, that works better than my error checking method.

--=20
Chris Frost | <http://www.frostnet.advicom.net/chris/>
-------------+------------------------------------------
Public PGP Key:
Email chris@frostnet.advicom.net with the subject "retrieve pgp key"
or visit <http://www.frostnet.advicom.net/chris/about/pgp_key.phtml>

--Fig2xvG2VGoz8o/s
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--Fig2xvG2VGoz8o/s--

Would

import operator
destination={}
assert len(list_of_keys)==len(list_of_values)
map(operator.setitem,len(list_of_keys)*[destination],list_of_keys,
list_of_values)

do the trick?

Maybe the "for" loop way is faster, though.

Alex.

Can anyone tell me why all of Chris's posts are showing up as
attachments at my end? (Outlook Express 5, win95b)

--

Emile van Sebille
emile@fenx.com
-------------------


Chris Frost <chris@frostnet.advicom.net> wrote in message
news:19990721084614.C15502@pooh.frostnet.net...

I think it's because you have to have Tools->Options->send... News - plain
text selected, not HTML?

N

Emile van Sebille <emile@fenx.com> wrote in message
news:T%kl3.3903$VL2.416831@news.direcpc.com...
>Can anyone tell me why all of Chris's posts are showing up as
>attachments at my end? (Outlook Express 5, win95b)
>
>--
>
>Emile van Sebille
>emile@fenx.com
>-------------------
>
>
>Chris Frost <chris@frostnet.advicom.net> wrote in message
>news:19990721084614.C15502@pooh.frostnet.net...
>
>

Emile van Sebille <emile@fenx.com> wrote:
> Can anyone tell me why all of Chris's posts are showing up as
> attachments at my end? (Outlook Express 5, win95b)

he's posting "multipart/signed" messages, by some reason.
looks like outlook express cannot deal with that.

(you can read his posts using ctrl-F3, btw...)

</F>

I think there's a C function in mxTools, as well.
Sue.