用python写栈

class StackFullError(Exception):
    pass

class StackEmptyError(Exception):
    pass

class Stack:
    def __init__(self, size):
        self.size = size
        self.lst = []
        self.top = 0  # 下一个元素准备装的位置

    def push(self, el):
        if self.top == self.size:
            raise StackFullError("栈满了")

        self.lst.insert(self.top, el)
        self.top += 1  # 栈顶指针

    def pop(self):
        if self.top == 0:
            raise StackEmptyError("栈空了")
        self.top -= 1
        return self.lst[self.top]

s = Stack(6)
s.push("1")
s.pop()

未优化线程同步