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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def check_non_equality_explicit_constraints(self,safe_variables,query):
        ''' Checking variables which occur in explicit constraints with non equality
        operators '''
        # Create a list of variables which occur in explicit constraints with non
        # equality operators
        variables_in_constraints_with_non_equality_operators = \
            [y for x in query.constraints \
               for y in [x.get_left_side(), x.get_right_side()] \
               if y.is_variable() and not x.is_equality_constraint()]

        for variable in variables_in_constraints_with_non_equality_operators:
            if not (variable in safe_variables):
                raise NotSafeException('Query not safe because ' + \
                    variable.name + \
                    ' from a non_equality comparison does not occur in a positive goal')
                return False

        return True