<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def stream_tap(callables, stream):
 """ Calls each callable with each item in the stream. Use with Buckets. Make a Bucket with a callable and then pass a tuple of those buckets in as the callables. After iterating over this generator, get contents from each Spigot. :param callables: collection of callable. :param stream: Iterator if values. """

    for item in stream:
        for caller in callables:
            caller(item)
        yield item