CODEWITHSUNDEEP
pythonpython-3.x
Dan
Dan

Reputation: 359

Python - Check if any item exists in all list of lists

I have a list of lists in Python (python3). Example:

list_of_lists = [[vendor1, vendor2],
                 [vendor2, vendor5, vendor10],
                 [vendor1, vendor2, vendor7]]

What I'm trying to do is find out if there is an item that is in ALL lists in the list of lists. Most of the examples I've come across the user has known what value to search for in their list of lists, hence me asking a separate question on here, as I don't have a starting value to search for. The result from the above list would return vendor2 since it shows up in all lists.

Any help/general "look in this direction" advice is appreciated. Thank you

Upvotes: 1

Views: 1167

Answers (2)

jizhihaoSAMA
jizhihaoSAMA

Reputation: 12672

Also could try reduce:

from functools import reduce

list_of_lists = [["vendor1", "vendor2"],
                 ["vendor2", "vendor5", "vendor10"],
                 ["vendor1", "vendor2", "vendor7"]]


result = list(reduce(lambda a, b: set(a) & set(b), list_of_lists))
# ['vendor2']

Upvotes: 2

bigbounty
bigbounty

Reputation: 17358

Assuming all elements of the list_of_lists are strings. Using set and intersection concepts. Create a set for each sublist and do intersection on all of them

In [3]: list_of_lists = [["vendor1", "vendor2"],
   ...:                  ["vendor2", "vendor5", "vendor10"],
   ...:                  ["vendor1", "vendor2", "vendor7"]]

In [4]: set.intersection(*[set(x) for x in list_of_lists])
Out[4]: {'vendor2'}

Upvotes: 5

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