Issubset and issuperset

issubset = S1 <= S2

issuperset = S1 >= S2

Issubset and issuperset.

S1 = set(["apple", "mango"])
S2 = set(["mango", "orange"])
S3 = set(["mango"])

issubset = S1 <= S2
print(issubset)                                # False

issuperset = S1 >= S2
print(issuperset)                              # False

issubset = S3 <= S2
print(issubset)                                # True

issuperset = S2 >= S3
print(issuperset)                              # True

See also

https://www.w3resource.com/python-exercises/sets/python-sets-exercise-10.php