Mariner Backtesting - Type Error

TypeError

A TypeError is thrown when an operand or argument passed to a function is incompatible with the type expected by that operator or function.

Sample Traceback

 Traceback (most recent call last):
  File "run_simulation.py", line 550, in <module>
    main(sys.argv[1:])
  File "run_simulation.py", line 525, in main
    results = simulator()
  File "/opt/anaconda/lib/python2.7/site-packages/tradesim/engine.py", line 542, in __call__
    return self.simulate()
  File "/opt/anaconda/lib/python2.7/site-packages/tradesim/engine.py", line 661, in simulate
    context_collection.process_event(event, delivery_timestamp)
  File "/opt/anaconda/lib/python2.7/site-packages/tradesim/context.py", line 712, in process_event
    event.context._call_on_timer(event)
  File "/opt/anaconda/lib/python2.7/site-packages/tradesim/context.py", line 465, in _call_on_timer
    self.strategy.on_timer(event, self.market, self.order, self.service, self.account)
  File "job/CQ71ac7bf05f34499bbe2a4df04f2a1908.py", line 105, in on_timer
    self.rebalance(md,order,service,account)
  File "job/CQ71ac7bf05f34499bbe2a4df04f2a1908.py", line 145, in rebalance
    print "Price of :" + new_prices.columns[i] + " is " + new_price
TypeError: cannot concatenate 'str' and 'float' objects

Sample Broken Code

 print "Price of :" + new_prices.columns[i] + " is " + new_price

Sample Fixed Code

 print "Price of :" + str(new_prices.columns[i]) + " is " + str(new_price)

Notes

You have tried to add a string and non-string type together. You can fix this by putting the non-string inside the parenthesis of str().