How do I check if a list contains all the elements of another list in Python? It's not working

Question

list1 = ['Gryffindor', 'Ravenclaw', 'Hufflepuff', 'Slytherin']
list2 = ['Gryffindor', 'Ravenclaw']

checkif = item in List2 for item in List1

if check is True:
    print("The list {} contains all elements of the list {}".format(List1, List2))

Why is this damn thing not working? Also is checkif = item in list2 for item in list1 a list comprehension or what?

Someone please correct my code, thanks.

Asked By: Shah Jacob

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Source

Answer 1

You can use sets here and specifically check the relationship whether one of your sets is a subset of the other:

set(list2).issubset(list1)   # True

To use this the first object must be a set hence set(list2) but the second can be any iterable. One caveat here is that since we’re comparing sets, it will only check for unique elements, i.e. it will not care about repeated values.

Answered By: pavel

Answer 2

I think you want all:

list1 = ['Gryffindor', 'Ravenclaw', 'Hufflepuff', 'Slytherin']
list2 = ['Gryffindor', 'Ravenclaw']

checkif = all(item in list1 for item in list2)

Also, you need to swap list1 and list1 to get the result you describe in the print line.

Answered By: Z4-tier

How do I check if a list contains all the elements of another list in Python? It's not working

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