(self)
Returns True if the current arc leads to an accept state (the end
        of a valid key).
Returns True if the current arc leads to an accept state (the end
        of a valid key).
Returns True if the current arc leads to an accept state ( the end of a valid key ) .
def accept(self):
        """Returns True if the current arc leads to an accept state (the end
        of a valid key).
        """

        raise NotImplementedError
def accept ( self ) : raise NotImplementedError