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import asyncio
import time
# define a coroutine
# async def main():
# print('hello coroutine!')
#
#
# # pause the execution of a coroutine
# async def main2():
# await main()
# print('continue execution')
async def display_time():
start_time = time.time()
while True:
dur = int(time.time() - start_time)
if dur % 3 == 0:
print('{} seconds have passed.'.format(dur))
await asyncio.sleep(1)
async def print_num():
num = 1
while True:
print(num)
num += 1
await asyncio.sleep(0.1)
async def main():
task1 = asyncio.ensure_future(display_time())
task2 = asyncio.ensure_future(print_num())
await asyncio.gather(task1, task2)
if __name__ == '__main__':
# asyncio.run(main())
ev_loop = asyncio.get_event_loop()
ev_loop.run_until_complete(main())
ev_loop.close()
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