<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def params_values(self):
 """ Get a list of the ``Parameter`` values if they have a value. This does not include the basis regularizer. """

        return [p.value for p in atleast_list(self.params) if p.has_value]