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#edge object for graphs

class Edge(object):
    
    def __init__(self, enter, exit, directed=False):
        self.enter = enter
        self.exit = exit
        self.directed = directed
    def __repr__(self):
        if self.directed:
            return str(self.enter) + "->" + str(self.exit)
        else:
            return str(self.enter) + "--" + str(self.exit)
    def path(self, node):
        if self.directed:
            if node == self.enter:
                return self.exit
            elif node == self.exit:
                return False
            else:
                raise ValueError("Node not found")
        else:
            if node == self.enter:
                return self.exit
            elif node == self.exit:
                return self.enter
            else:
                raise ValueError("Node not found")