# SuperFastPython.com
# example of an async context manager via async with
import asyncio

# define an asynchronous context manager
class AsyncContextManager:
    # enter the async context manager
    async def __aenter__(self):
        # report a message
        print('>entering the context manager')
        # block for a moment
        await asyncio.sleep(0.5)

    # exit the async context manager
    async def __aexit__(self, exc_type, exc, tb):
        # report a message
        print('>exiting the context manager')
        # block for a moment
        await asyncio.sleep(0.5)

# define a simple coroutine
async def custom_coroutine():
    # create and use the asynchronous context manager
    async with AsyncContextManager() as manager:
        # report the result
        print(f'within the manager')

# start the asyncio event loop
asyncio.run(custom_coroutine())
