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# fnss.traffic.trafficmatrices.TrafficMatrix.pop_flow

`TrafficMatrix.``pop_flow`(origin, destination)

  Pop a flow from the traffic matrix and return the volume of the flow removed. If the flow to remove does not exist, a KeyError is raised.

  Parameters: | origin : any hashable type The origin node destination : any hashable type The destination node
  Returns: | volume : float The volume of the flow popped from the matrix
  Raises: | KeyError: : if there is no flow from the given origin to the given destination

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