A slightly modified version of the 'schedule' Python package that works with asyncio 😎

async_schedule.py

import emoji
import schedule
import asyncio
import inspect

from datetime import datetime


class Job(schedule.Job):

    async def run(self):
        if (inspect.iscoroutine(self.job_func.func)
            or inspect.iscoroutinefunction(self.job_func.func)):
            ret = await self.job_func()
        else:
            ret = self.job_func()


class Scheduler(schedule.Scheduler):

    async def run_pending(self):
        runnable_jobs = (job for job in self.jobs if job.should_run)

        for job in sorted(runnable_jobs):
            ret = await job.run()

            if isinstance(ret, schedule.CancelJob) or ret is schedule.CancelJob:
                self.cancel_job(job)

    def every(self, interval=1):
        job = Job(interval)
        self.jobs.append(job)
        return job


async def show_me_emoji(emoji, count=10):
    print(' '.join(emoji * count))
    

def print_sync(message='this is a sync function'):
    print(message)


async def run_scheduler(scheduler):
    while True:
        await scheduler.run_pending()
        await asyncio.sleep(1)


if __name__ == '__main__':

    loop = asyncio.get_event_loop()
    sch = Scheduler()

    sch.every(5).seconds.do(show_me_emoji, '🐍')
    sch.every(5).seconds.do(print_sync)
    sch.every(5).seconds.do(show_me_emoji, '🍺🍹🍷🍸', 3)
    sch.every(5).seconds.do(print_sync, 'can you believe it')
    sch.every(5).seconds.do(show_me_emoji, '💥')

    loop.run_until_complete(run_scheduler(sch))

Another fix for when you're instantiating the job in the every method. This tells the Job which scheduler to register with (the custom one you've made). Also, I removed the self.jobs.append line from the every method. When you instantiate the job with the Scheduler you've just implemented, it will automatically add the job to it's list of jobs to run. Here's the line in the scheduler library that does that.

class Scheduler(schedule.Scheduler):

    async def run_pending(self):
        runnable_jobs = (job for job in self.jobs if job.should_run)

        for job in sorted(runnable_jobs):
            ret = await job.run()

            if isinstance(ret, schedule.CancelJob) or ret is schedule.CancelJob:
                self.cancel_job(job)

    def every(self, interval=1):
        job = Job(interval, self)
        return job