Counting unique nested lists

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I have a nested list, like

list1 = [['banana', 'apple', 'orange', 'tomato'], ['apple', 'orange', 'tomato', 'banana'], ['orange', 'tomato', 'banana', 'apple'], ['banana', 'apple', 'orange', 'tomato'], ['apple', 'orange', 'tomato', 'banana']]

how do I calculate the unique quantity? In this case, there are 3 unique nested lists: ['banana', 'apple', 'orange', 'tomato'], ['apple', 'orange', 'tomato', 'banana'], ['orange', 'tomato', 'banana', 'apple']

In fact, the length of the nested list will be from two to three thousand

list python
1 Answers

If you convert each list to a tuple, you can put them all in a set which automatically eliminates the duplicates:

>>> {tuple(fruits) for fruits in list1}
{('orange', 'tomato', 'banana', 'apple'), ('apple', 'orange', 'tomato', 'banana'), ('banana', 'apple', 'orange', 'tomato')}

If you want to get that back into the list-of-lists form:

>>> [list(fruits) for fruits in {tuple(fruits) for fruits in list1}]
[['orange', 'tomato', 'banana', 'apple'], ['apple', 'orange', 'tomato', 'banana'], ['banana', 'apple', 'orange', 'tomato']]
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