set.issubset
Check that every item of the set is in other.
Python 3.13
set.issubset(other)Parameters
- otherIterable
- The collection to compare the set with.
Return value
True or False; an empty set is a subset of any set.
Examples
Subset check
Python 3.13
print({1, 2}.issubset({1, 2, 3}))True
An equal set is a subset too
Python 3.13
a = {1, 2}
print(a.issubset([2, 1]), a < {1, 2})True False
Details
For sets, the <= operator does the same, and the < operator also checks that the sets are not equal.