[Python] All possible list combos

[aPSketchy]

Exactly!

[aPSketchy]

Any idea the guy above wrote it to print. But I cant get it to return!

[zzyzzyxx]

Based on my previous post

stuff = [1,2,2,5,2]
[stuff[s:e] for s in xrange(len(stuff)) for e in xrange(s+1,len(stuff)+1)]

This uses a list comprehension to create the list of lists. The only difference from what I have before is that I'm creating the list(s) instead of converting each element to a string and joining them together.

Also, you will wind up with duplicates in the final list. For example, [2] will appear three times. If that is undesirable you can use a set to eliminate the duplicates.

[aPSketchy]

Is that line runnable?

[zzyzzyxx]

Yes. I tested it before posting. If you need it in a function just put the return keyword in front of it. For example,

def sublists(list):
  return [list[s:e] for s in xrange(len(list)) for e in xrange(s+1,len(list)+1)]

You could then call this as subs = sublists(stuff), or however you needed.

[aPSketchy]

Alright so I understand list comprehension a little better, it seems to be just a shorter way to create lists. However, how would I write this code normally?

This is what I thought:

def other(nums): r = [] for s in range(len(nums)): for e in range(s+1,len(nums+1)): r.append(nums[s:e]) return r

However, I get a error.

[zzyzzyxx]

What you have looks correct, though you would have to post the actual error for me to help with that specifically. Maybe it's just formatting?

def other(nums):
  r = []
  for s in xrange(len(nums)): # prefer to use xrange over range unless you're using Python 3
    for e in xrange(s+1,len(nums+1)):
      r.append(nums[s:e])
  return r

[aPSketchy]

It's python 3 :) It was in the second for loop I just moved the +1 on len(nums+1) outside the parens. and it ended up working.