class Test:
    init_count = 0

    def __init__(self):
        Test.init_count += 1
        print("T ", end="")

    def __copy__(self):
        print("（拷贝构造，不触发__init__）", end="")
        new_obj = Test.__new__(Test)
        return new_obj

if __name__ == "__main__":
    a = Test()
    import copy
    b = copy.copy(a)