<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def triggering_streams(streams):
 """ Temporarily declares the streams as being in a triggered state. Needed by DynamicMap to determine whether to memoize on a Callable, i.e. if a stream has memoization disabled and is in triggered state Callable should disable lookup in the memoization cache. This is done by the dynamicmap_memoization context manager. """

    for stream in streams:
        stream._triggering = True
    try:
        yield
    except:
        raise
    finally:
        for stream in streams:
            stream._triggering = False