在我的自定义集合中使用集合？

class CustomSet:
    def __init__(self):
        self.elements = set()

    def add(self, element):
        self.elements.add(element)

    def remove(self, element):
        if element in self.elements:
            self.elements.remove(element)

    def contains(self, element):
        return element in self.elements

    def union(self, other_set):
        return CustomSet.from_set(self.elements.union(other_set.elements))

    def intersection(self, other_set):
        return CustomSet.from_set(self.elements.intersection(other_set.elements))

    def difference(self, other_set):
        return CustomSet.from_set(self.elements.difference(other_set.elements))

    @classmethod
    def from_set(cls, elements):
        custom_set = cls()
        custom_set.elements = elements
        return custom_set

# 示例用法
set1 = CustomSet()
set1.add(1)
set1.add(2)
set1.add(3)

set2 = CustomSet()
set2.add(2)
set2.add(3)
set2.add(4)

union_set = set1.union(set2)
print("Union:", union_set.elements)  # 输出: Union: {1, 2, 3, 4}

intersection_set = set1.intersection(set2)
print("Intersection:", intersection_set.elements)  # 输出: Intersection: {2, 3}

difference_set = set1.difference(set2)
print("Difference:", difference_set.elements)  # 输出: Difference: {1}