Ara Kooser wrote: Your question is not very clear but I made some guesses below.
> zz = raw_iput("What kind of yeast cell do you want to add? > Options:GoodYeast") > #Here I want to call this instace of GoodYeast from yeast_cell.py So you want the user to input the name of a class and you create an instance of the class? Try cls = getattr(yeast_cell, zz) instance = cls() > class GoodYeast: > #Cooperates all the time > YEAST = 'G' > #Should change generic variable @ in the world to G??? This is just assigning a class variable. The assignment is made at the time the class is defined, not when an instance is created, so that is not what you want either. > def __init__(self,name): > self.name = name > currency = 0 > location = [] I agree with John that changing a global variable in another module when a class instance is created doesn't seem like a great design, but you can do it here with import main # or whatever the main module is called main.YEAST = 'G' In general it is good to avoid circular dependencies like this, they lead to a variety of complications. Maybe YEAST could be a variable in the yeast_cell module? Kent _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor