def _pre_mailbox_hook(self, f):
        return
Return a list of the incoming edges.
dataset/ETHPy150Open babble/babble/include/jython/Lib/mailbox.py/_singlefileMailbox._pre_mailbox_hook--crossover with--dataset/ETHPy150Open networkx/networkx/networkx/classes/tests/timingclasses.py/TimingMultiDiGraph.in_edges