code: def createMarketOrder(
      self, action, instrument, quantity, onClose=False
  ):
      raise Exception("Market orders are not supported")
  
file_path: pyalgotrade/pyalgotrade/bitstamp/broker.py
imports: from pyalgotrade import broker
  from pyalgotrade.broker import backtesting
  from pyalgotrade.bitstamp import common
  from pyalgotrade.bitstamp import livebroker
label_desc: Use image node_id 4 for calling the BacktestingBroker obj's underlying member method code with example usage: obj.createMarketOrder(action, instrument, quantity, onClose) without return types