_retry_function.py

def _retry_function( function_to_try, args ):
    return_value=None
    for try_number in range(0, 3):
      try:
        return_value = function_to_try( *args )
        if return_value is True:
          break
        raise Exception("function failed")
      except:
        time.sleep(2**try_number)
        pass
      raise Exception("Retry of function {} failed".format(function_to_try.__name__))