CODEWITHSUNDEEP
pythonset
sachinruk
sachinruk

Reputation: 9869

unique elements of list of lists

I have a list similar to the following (which I have conveniently converted tuple of tuples of tuples so that set can get the unique elements.

mylist = ((('pen','pineapple'),('apple','pen')),(('pineapple','pen')),(('apple','pen'),('pen','pineapple')))
set(mylist)

>>>
{(('pen', 'pineapple'), ('apple', 'pen')),
('pineapple', 'pen'),
(('apple', 'pen'), ('pen', 'pineapple'))}

However, the element ('apple', 'pen'), ('pen', 'pineapple') == ('pen', 'pineapple'), ('apple', 'pen') as far as my application is concerned. Is there a quick python method to get the unique elements disregarding order of elements.

Edit 1: As pointed out in comments: (( 'pen', 'apple'), ('pen', 'pineapple')) != (('apple', 'pen'), ('pen', 'pineapple')). i.e. I do not want to rearrange the innermost tuples. However, it is ok to rearrange the middle level of tuples.

Btw I was hoping for something a bit pythonic (or fancier) than using sort and then using set.

Upvotes: 1

Views: 309

Answers (1)

Blender
Blender

Reputation: 298106

Make a set of sets. Sets can only contain immutable objects, so you'll have to convert every tuple into a frozenset and then make a set out of it:

In [4]: set(map(frozenset, mylist))
Out[4]:
{frozenset({('apple', 'pen'), ('pen', 'pineapple')}),
 frozenset({'pen', 'pineapple'})}

Upvotes: 4

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