集合1-python3

"""
定义和使用集合

Version: 1.0.0
Author: Catherine
Data: 2019-03-11
"""


def main():
    # set1 = {1, 2, 3, 3, 3, 2}
    # print(set1)
    # print(len(set1))
    #
    # set2 = set(range(1, 10))
    # print(set2)
    #
    # set1.add(4)
    # set1.add(5)
    # print(set1)
    #
    # set2.update([11, 12])
    # print(set2)
    #
    # set2.discard(5)
    # print(set2)
    #
    # if 4 in set2:
    #     set2.remove(4)
    # print(set2)
    #
    # for elem in set2:
    #     print(elem ** 2, end=' ')
    # print()

    set3 = set((1, 2, 3, 3, 2, 1))
    print(set3)
    print(set3.pop())
    print(set3)


if __name__ == "__main__":
    main()