code: def trace(function, *args, **k) :
  	
  
  	if doTrace : print ("> "+function.__name__, args, k)
  	result = function(*args, **k)
  	if doTrace : print ("< "+function.__name__, args, k, "->", result)
  	return result
docs: Decorates a function by tracing the begining and
  	end of the function execution, if doTrace global is True