Problem with using sets and issubset in Python

Solution 1:

As written, some_cords is a set with 3 elements, each one is a tuple: (1, 2), (2, 2) and (3, 2). On the other hand, line_cords is a set of 4 tuples, each tuple being a tuple of length 3.

Adding parenthesis around the tuples of some_cords will turn it into a set with one element similar to the ones of line_cords:

some_cords = {((1, 2), (2, 2), (3, 2))}

and the first test will return True

As for the second test (using in), some_cords is a set, and each element of line_cords is a tuple, so it will always return False. This test would be OK if some_cords was a tuple: you can achieve this removing the braces, but then you can not use issubset.