Trouble with multithreading python -

having lot of trouble adding additional thread program'. sits accesses api , executes trades on account. fine , until try , pass streaming rate stoploss order. once run way code runs loop blocking out else , prints latest price. how can set thing run concurrently other 2 threads?

main trading program:

import queue import threading import time import json import streamer   execution import execution settings import stream_domain, api_domain, access_token, account_id strategy import testrandomstrategy streaming import streamingforexprices event import tickevent streamer import demo  stop = demo(0)   def trade(events, strategy, execution):     """     carries out infinite while loop polls     events queue , directs each event either     strategy component of execution handler.     loop pause "heartbeat" seconds ,     continue.     """     while true:         try:             event = events.get(false)         except queue.empty:             pass         else:             if event not none:                 if event.type == 'tick':                     strategy.calculate_signals(event)                 elif event.type == 'order':                     print "executing order!"                     execution.execute_order(event)                 elif event.type == 'stoploss':                     print "stop loss here!!!!"                     execution.execute_order(event)         time.sleep(heartbeat)       if __name__ == "__main__":     heartbeat = 0  # half second between polling     events = queue.queue()          # trade 1000 unit of eur/usd      instrument = "eur_usd"     units = 1     stoploss = stop         # create oanda market price streaming class     # making sure provide authentication commands     prices = streamingforexprices(         stream_domain, access_token, account_id,         instrument, events     )     #handle stoploss price     stop = demo(0)      # create execution handler making sure     # provide authentication commands     execution = execution(api_domain, access_token, account_id)      # create strategy/signal generator, passing     # instrument, quantity of units , events queue     strategy = testrandomstrategy(instrument, units, events, stoploss)      # create 2 separate threads: 1 trading loop     # , market price streaming class     trade_thread = threading.thread(target=trade, args=(events, strategy, execution))     price_thread = threading.thread(target=prices.stream_to_queue, args=[])     stop_thread = threading.thread(target=stop, args=[])       # start both threads     trade_thread.start()     price_thread.start()     stop_thread.start() 

any appreciated!

edit: ok have drilled down problem think. code here executes trades , when try , post "prices" stoploss order script gives me error. example:

stoploss = prices      nameerror: name 'prices' not defined  

on other hand, in trying simplify problem post here solved 1 having!

code:

def trade(events, strategy, execution):      while true:         prices = demo(0)         print prices      while true:         try:             event = events.get(false)         except queue.empty:             pass         else:             if event not none:                 if event.type == 'tick':                     strategy.calculate_signals(event)                 elif event.type == 'order':                     print "executing order!"                     execution.execute_order(event)         time.sleep(heartbeat)     if __name__ == "__main__":     heartbeat = 0  # half second between polling     events = queue.queue()      # trade 1000 unit of eur/usd      instrument = "eur_usd"     units = 1     stoploss = prices