Python栈哪块有问题，请指正。

def init(self, max):
self.maxstacksize = 10
self.s = [None for x in range(0, self.maxstacksize)]
self.top = -1

def isemptystack(self):
if self.top == -1:
iTop = True
else:
iTop = False
return iTop

def pushstack(self, x):
if self.top < self.maxstacksize-1:
self.top = self.top+1
self.s[self.top] = x
else:
print("栈满")
return

def popstack(self):
if self.isemptystack():
print("栈为空")
return
else:
itop = self.top
self.top = self.yop-1
return self.s[itop]

def gettopstack(self):
if self.isemptystack():
print("栈为空")
return
else:
return self.s[self.top]

def stacktraverse(self):
if self.isemptystack(self):
print("栈为空")
return
else:
for i in range(0, self.top+1):
print(self.s[i], end=' ')

def createstackbyinput(self):
data = input("请输入元素(继续输入请按回车键，结束请输入‘#’):")
while data != '#':
self.pushstack(data)
data = input("请输入元素: ")

ss='SequenceStack'()
ss.createstackbyinput()
print("栈内的元素为: ", end=' ')
ss.stacktraverse()

几个比较明显的问题：
1、未写类名，class SequenceStack:
2、初始化给的max参数未用到
3、popstack的else分块中self.top = self.yop - 1 → self.top = self.top - 1
4、stacktraverse的if判断条件self.isemptystack(self)多传入了self参数
5、createstackbyinput中第一个input语句的#两侧中文引号问题
6、调用部分ss = 'SequenceStack'()不应加引号

class SequenceStack:    
    def __init__(self, max = 10):
        self.maxstacksize = max
        self.s = [None for x in range(0, self.maxstacksize)]
        self.top = -1

    def isemptystack(self):
        if self.top == -1:
            iTop = True
        else:
            iTop = False
        return iTop

    def pushstack(self, x):
        if self.top < self.maxstacksize - 1:
            self.top = self.top + 1
            self.s[self.top] = x
        else:
            print("栈满")
            return

    def popstack(self):
        if self.isemptystack():
            print("栈为空")
            return
        else:
            itop = self.top
            self.top = self.top - 1
        return self.s[itop]

    def gettopstack(self):
        if self.isemptystack():
            print("栈为空")
            return
        else:
            return self.s[self.top]

    def stacktraverse(self):
        if self.isemptystack():
            print("栈为空")
            return
        else:
            for i in range(0, self.top + 1):
                print(self.s[i], end=' ')

    def createstackbyinput(self):
        data = input("请输入元素(继续输入请按回车键，结束请输入'#'):")
        while data != '#':
            self.pushstack(data)
            data = input("请输入元素: ")

if __name__ == '__main__':
    ss = SequenceStack()
    ss.createstackbyinput()
    print("栈内的元素为: ", end=' ')
    ss.stacktraverse()