## Creature Project
## CSC323: Group 1: Nora, Terian, Josh, and Jordan
## 4/7/10
## Predicate.py: Contains the methods that call LogicPredicate and TestPredicate
###Borrowed code from Group 0

class Predicate:
    '''an interface for Predicates. No methods are actually implemented'''
    def __init__(self):
        pass
    def holds(self, world, location):
        pass
    def __str__(self):
    	pass
        
class LogicPredicate(Predicate):
    '''an abstract class for logic predicates like AND OR NOT. It implements a constructor that accepts a list of predicates'''
    def __init__(self, *predlist):
        self.predicateList = predlist  
        
class TestPredicate(Predicate):
    '''an abstract class for predicates that actually look at a state It implements an init method that accepts a dictionary that contains the state to check for'''
    def __init__(self, ds, dn):
        self.desiredSpecies = ds
        self.desiredNum = dn
 #changed parameters of testpredicates to two values, a species and a number.