asynctest.py 文件源码

def isawaitable(obj):
    ''' Return True if the object is an awaitable or is a function that
    returns an awaitable.

    This function is used internally by aiotesting.
    '''
    if PY35:
        result = inspect.iscoroutinefunction(obj) or inspect.isawaitable(obj)

    elif PY34:
        result = (isinstance(obj, asyncio.Future) or
                  asyncio.iscoroutine(obj) or
                  hasattr(obj, '__await__'))
    else:
        raise Exception(
            'isawaitable is not supported on Python {}'.format(
                sys.version_info))
    return result