multiplication of lists of strings

[Jason]

How could I return a list or tuple of each unique combination of a given
set of lists (perhaps from a dict or a list). This means the number of
lists are not known nor is the length of each.

Here is an example:
fruit = ['apple', 'orange']
numbers = ['one', 'two', 'three']
names = ['joe']

Order matters (I started by trying to iterate over a list corresponding
to keys in the dict that contains these lists). Furthermore, (a, b) is
different from (b, a) however I will filter out all but unique (a, a) if
that occurs.

Once this step is solved, I then will use each tuple as a key in a dict.

I appreciate any assistance you can throw my way.

Jason G

 

[Gabriel Genellina]

How could I return a list or tuple of each unique combination of a given
set of lists (perhaps from a dict or a list). This means the number of
lists are not known nor is the length of each.

Use the Google interfase for this group:
http://groups.google.com/group/comp.lang.python/
Type "unique combinations lists" in the text box; press "Search in this
group". The very first result contains some answers to your question.

 

[Jason Galyon]

Use the Google interfase for this group:
http://groups.google.com/group/comp.lang.python/
Type "unique combinations lists" in the text box; press "Search in this
group". The very first result contains some answers to your question.

found it, the referenced cookbook recipe is perfect.

Thanks, Gabriel

 

[castironpi]

found it, the referenced cookbook recipe is perfect.

Thanks, Gabriel

That reminds me: Is there a generic 'relation' pattern/recipie, such
as finding a computer that's "paired" with multiple users, each of who
are "paired" with multiple computers, without maintaining dual-
associativity?

Good:

py> user.getcomputers()
[ Compie1, Compie2 ]

Bad:

user._computers.add( compieN )
compieN._users.add( user )

?

 

[Bruno Desthuilliers]

(e-mail address removed) a écrit :
(snip)

That reminds me: Is there a generic 'relation' pattern/recipie, such
as finding a computer that's "paired" with multiple users, each of who
are "paired" with multiple computers, without maintaining dual-
associativity?

Yes : use a relational database.

 

[castironpi]

(e-mail address removed) a écrit :
(snip)


Yes : use a relational database.

No performance hit. Can I write an ad hoc relational class structure?

 

[castironpi]

No performance hit.  Can I write an ad hoc relational class structure?

What do you think of this solution?

http://jtauber.com/blog/2005/11/10/relational_python:_basic_class_for_relations/

http://www.google.com/search?hl=en&q=python+relational+class+-database