[Zope-dev] Intersection (set) in Zope

[Amos Latteier]

At 07:13 AM 9/9/99 -0800, Jason Spisak wrote:
>Does anyone know if Zope already has (I'll bet it does, it's just a
>matter of finding it, which I haven't yet) an object or method for
>intersection or set of two lists.  I want items common to both lists. 
>It's a simple python external method, but why write code t hat's already
>written.  I combed the dtml guide and the source in places and can't see
>what it would be called.  Any ideas?


There is the intSet module which gives you a cool intSet object which
supports intersection, union, and difference.

However, if you don't have enormous lists and/or your list items aren't
integers it's probably fine to do this:

def intersection(list1, list2):
  result=[]
  for item in list1:
    if item in list2:
      result.append(item)
  return result

Good luck.

-Amos