import uasyncio as asyncio


class Queue:
    def __init__(self):
        self.items = []
        self.waiters = []

    async def put(self, item):
        self.items.append(item)
        if self.waiters:
            waiter = self.waiters.pop(0)
            waiter.set()

    async def get(self):
        while not self.items:
            event = asyncio.Event()
            self.waiters.append(event)
            await event.wait()

        return self.items.pop(0)