如何创建包含类实现的优先级队列？

class QueueElement:
    def __init__(self, value, priority):
        self.value = value
        self.priority = priority

class PriorityQueue:
    def __init__(self):
        self.queue = []

    def enqueue(self, value, priority):
        element = QueueElement(value, priority)
        inserted = False
        for i in range(len(self.queue)):
            if element.priority < self.queue[i].priority:
                self.queue.insert(i, element)
                inserted = True
                break
        if not inserted:
            self.queue.append(element)

    def dequeue(self):
        if not self.is_empty():
            return self.queue.pop(0)
        else:
            return None

    def is_empty(self):
        return len(self.queue) == 0

    def peek(self):
        if not self.is_empty():
            return self.queue[0]
        else:
            return None