[pox-dev] How to use popen to send parallel iperf?

[博威张]

Hi,

The popen function is here : Node.popen(self,args,kwargs)
I have read *examples/popenpoll.py* and  *examples/popen.py*, both of which
only show multiple pings.
I don't know the exact meaning of two parameters(*args *and *kwargs*) and
their format of usage.

Thank you,
Bowei
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