recipe-498259.py 文件源码

def observation(observe, notify):
    """Simple boilerplate to link to the 'with' statement.

    Contextlib's contextmanager decorator is a very convenient way to
    create simple context managers, specifically the __enter__ and
    __exit__ special methods.
    """

    proxy = Observation(observe, notify)
    try:
        yield proxy
    finally:
        proxy.close()