CODEWITHSUNDEEP
pythonset
אסף וורמברנד
אסף וורמברנד

Reputation: 1

identical sets == False anyone know why?

I created a code that compares between sets, when I intersect between two sets, I want to check if they are the same. However the last line of code that does the check returns false, does anyone know why? 

x = ['bomb', 'lock', 'clock']
y = ['bomb', 'lock', 'clock']
def cards_intersect(card1, card2):
    card1 = set(card1) #turning cards into sets
    card2 = set(card2)
    return card1.intersection(card2) # return intersection of sets
print(x)
print(cards_intersect(x, y))
print(cards_intersect(x, y) == x) #why false?

Upvotes: 0

Views: 85

Answers (3)

flyDeTom
flyDeTom

Reputation: 11

cards_intersect(x, y) and x has different type.

type(cards_intersect(x, y)) is set, type(x) is list.

It is like the difference between 1 and '1'

Upvotes: 1

Riccardo Bucco
Riccardo Bucco

Reputation: 15364

As you can see from your print statements

['bomb', 'lock', 'clock']
{'bomb', 'lock', 'clock'}

x and cards_intersect(x, y) are different. The first one is a list, the second one is a set. You may want to compare two sets:

print(set(x) == cards_intersect(x,y)) # True

Upvotes: 1

user3980558
user3980558

Reputation:

The cards_intersect function only changes card1, card2 inside the function's scope. Therefore when you are comparing cards_intersect(x, y) which returns a set, to the list x - you get false. You can compare in the following way:

print(cards_intersect(x, y) == set(x))

Upvotes: 0

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