async def get_session(self):
    if (self.session is None):
        self.session = aiohttp.ClientSession()
        self.semaphore = asyncio.Semaphore(value=7)
        return self.session
    else:
        return self.session
async def get_session(self):
    if (self.session is None):
        self.session = aiohttp.ClientSession()
        self.semaphore = asyncio.Semaphore(value=7)
        return self.session
    else:
        return self.session