Python顺序表加法请指正

class SequenceList(object):
def init(self):
self.seq_list = []

def create_sequence_list(self):
    element = input("请输入（按回车键确认，按#键结束）：")
    while element != '#':
        self.seq_list.append(int(element))
        element = input("请输入（按回车键确认，按#键结束）：")

def print_sequence_list(self):
    print('顺序表中的元素为：', self.seq_list)


def _add_(self):
    number = int(input('请输入想增加的值'))
    self.seq_list = [int(i)+number for i in self.seq_list]
    print(self.seqlist)

list_1 = SequenceList()
list_1.create_sequence_list()
list_1.print_sequence_list()
list_1.add()

def add(self):#你是要运算符重载嘛，看上去又不像。把下划线都去掉吧

    number = int(input('请输入想增加的值'))

    self.seq_list = [int(i)+number for i in self.seq_list]

    print(self.seqlist)#这个打印的变量是打错了了吧，少了个下划线