code: def handle_commission(self, cost):
      # Deduct from our total cash pool.
      self.adjust_cash(-cost)
  
imports: from __future__ import division
  import logbook
  import numpy
  from collections import namedtuple
  from catalyst.assets import Future
  from six import itervalues, iteritems
  import catalyst.protocol
  from catalyst.constants import LOG_LEVEL
label_desc: Use image node_id 11 for calling the PerformancePeriod obj's underlying member method code with example usage: obj.handle_commission(cost) without return types