Не работает asyncio на macOS?

import asyncio


async def main():
    print('hello')
    await asyncio.sleep(1)
    print('world')


asyncio.run(main())

$ which python3.7
/Library/Frameworks/Python.framework/Versions/3.7/bin/python3.7

$ python3.7 asyncio.py 
Traceback (most recent call last):
  File "asyncio.py", line 1, in <module>
    import asyncio
  File "asyncio.py", line 10, in <module>
    asyncio.run(main())
AttributeError: module 'asyncio' has no attribute 'run'