code: def parameters_generator(instrument, smaFirst, smaLast):
      for sma in range(smaFirst, smaLast + 1):
          yield (instrument, sma)
  
file_path: pyalgotrade/testcases/optimizer_test.py
imports: import sys
  import logging
  from .None import common
  from pyalgotrade.optimizer import local
  from pyalgotrade import strategy
  from pyalgotrade.barfeed import yahoofeed
  import sma_crossover
label_desc: Use image node_id 1 for calling a global function with example usage: parameters_generator(instrument, smaFirst, smaLast) without return types