Agfdhyk

If I run this code, there is no error

import asyncio  

import time  

import types

from datetime import datetime



loop = None



def sleep_func(sec):

    time.sleep(sec)

    return



async def custom_sleep():  

    print('SLEEP {}n'.format(datetime.now()))

    await loop.run_in_executor(None, sleep_func, 2)



async def factorial(name, number):  

    f = 1

    for i in range(2, number+1):

        print('Task {}: Compute factorial({})'.format(name, i))

        await custom_sleep()

        f *= i

    print('Task {}: factorial({}) is {}n'.format(name, number, f))







if __name__ == '__main__':



    start = time.time()  

    loop = asyncio.get_event_loop()

    tasks = [  

        asyncio.ensure_future(factorial("A", 3)),

        asyncio.ensure_future(factorial("B", 4)),

    ]

    loop.run_until_complete(asyncio.wait(tasks))  

    print('sdfsdfdf')

    loop.close()

    end = time.time()  

    print("Total time: {}".format(end - start))

however, if I remove if __name__ == '__main__':, I would get

RuntimeError: This event loop is already running

funny thing is when I get this error, ipython still run and print text that I programmed

why does this error happen?

Add:
My python environment is Anaconda and python 3.7
I executed this code on Spyder(Ipython Kernel)

When I executed code on basic python terminel(not ipython), there was no any error messages

Script name is test_asy.py