class Visitor:

    def __init__(self, name, phone, email):

        self.name = name

        self.phone = phone

        self.email = email

        self.blacklisted = False



class MyProgram:

    def __init__(self):

        self.visitors = []



    def add_visitor(self, visitor):

        self.visitors.append(visitor)



    def remove_visitor(self, visitor):

        if visitor in self.visitors:

            self.visitors.remove(visitor)



    def check_blacklist(self, visitor):

        if not visitor.blacklisted:

            return True

        else:

            return False



# 示例用法

myprogram = MyProgram()

visitor1 = Visitor("张三", "13800138000", "zhangsan@example.com")

myprogram.add_visitor(visitor1)

print(myprogram.check_blacklist(visitor1))  # 输出：True