def flat_map(self, flatmap_function):
from heronpy.streamlet.impl.flatmapbolt import FlatMapStreamlet<EOL>fm_streamlet = FlatMapStreamlet(flatmap_function, self)<EOL>self._add_child(fm_streamlet)<EOL>return fm_streamlet<EOL>
Return a new Streamlet by applying map_function to each element of this Streamlet
           and flattening the result