同样的逻辑也适用于c++，但在python中不适用于堆栈中的最大值，我的代码中是否遗漏了什么？

class MaxStack:
    def __init__(self):
        self.stack = []
        self.max_stack = []

    def push(self, value):
        self.stack.append(value)
        if not self.max_stack or value >= self.max_stack[-1]:
            self.max_stack.append(value)

    def pop(self):
        if self.stack:
            value = self.stack.pop()
            if value == self.max_stack[-1]:
                self.max_stack.pop()
            return value
        return None

    def get_max(self):
        return self.max_stack[-1] if self.max_stack else None

# 使用示例
max_stack = MaxStack()
max_stack.push(3)
max_stack.push(5)
print(max_stack.get_max())  # 输出: 5
max_stack.push(2)
print(max_stack.get_max())  # 输出: 5
max_stack.pop()
print(max_stack.get_max())  # 输出: 5