Hamper plugin mock up | Python Fiddle

import re

class Conditional(object):
    """Default conditional, always says True."""
    
    def __init__(self, target):
        self.target = target
    
    def __call__(self, comm):
        return True

class RegexConditional(Conditional):
    
    def __init__(self, regex, *args, **kwargs):
        super(RegexConditional, self).__init__(*args, **kwargs)
        self.regex = regex
    
    def __call__(self, target, comm):
        return re.match(self.regex, comm)

class Actor(object):
    """Default actor. Does nothing, contains the default conditional."""
    
    def __init__(self):
        pass
    
    def act(self, comm):
        pass
    
    condition = Conditional(Actor)

class ComplicatedActor(object):
    
    def __init__(self):
        self.my_regex = RegexConditional('hi there')
        self.cond2 = Conditional()
    
    condition = lambda comm: self.my_regex(comm) and self.cond2(comm)
    
a = Actor()
print a.condition("hi")
if a.condition("hi"):
    a.act("hi")

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