[Tutor] AttributeError: instance has no __call__ method

[Marc Gartler]

Hi everybody,

Prior to this chunk of code 'glass' has been chosen from a list of 
colors via user input, and I now want to have that choice connect to 
one of several possible classes:

def glass_type(glasstype):
	if glasstype == 'Red':
		myglass = RedGlassCost()
	elif glasstype == 'Blue':
		myglass = BlueGlassCost()
	elif glasstype == 'Yellow':
		myglass = YellowGlassCost()
	return myglass

glasschoice = glass_type(glass)
myglass = glasschoice()


I've tried various approaches and keep getting different errors.  But 
this one seems closest to my goal, as I know it is at least passing 
'glass' into the function:

AttributeError: RedGlassCost instance has no __call__ method

What is this trying to tell me?  Or is that irrelevant as I would be 
better off trying some other approach altogether?