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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_copy_for(self):
 """Check the value of copy_for and make appropriate copies."""

        if not self._bundle:
            return

        # read the following at your own risk - I just wrote it and it still
        # confuses me and baffles me that it works
        for param in self.to_list():
            if param.copy_for:
                # copy_for tells us how to filter and what set of attributes
                # needs a copy of this parameter
                #
                # copy_for = {'kind': ['star', 'disk', 'custombody'], 'component': '*'}
                # means that this should exist for each component (since that has a wildcard) which
                # has a kind in [star, disk, custombody]
                #
                # copy_for = {'kind': ['rv_dep'], 'component': '*', 'dataset': '*'}
                # means that this should exist for each component/dataset pair with the
                # rv_dep kind

                attrs = [k for k,v in param.copy_for.items() if '*' in v]
                # attrs is a list of the attributes for which we need a copy of
                # this parameter for any pair

                ps = self._bundle.filter(check_visible=False, check_default=False, force_ps=True, **param.copy_for)
                metawargs = {k:v for k,v in ps.meta.items() if v is not None and k in attrs}
                for k,v in param.meta.items():
                    if k not in ['twig', 'uniquetwig'] and k not in attrs:
                        metawargs[k] = v
                # metawargs is a list of the shared tags that will be used to filter for
                # existing parameters so that we know whether they already exist or
                # still need to be created

                # logger.debug("_check_copy_for {}: attrs={}".format(param.twig, attrs))
                for attrvalues in itertools.product(*(getattr(ps, '{}s'.format(attr)) for attr in attrs)):
                    # logger.debug("_check_copy_for {}: attrvalues={}".format(param.twig, attrvalues))
                    # for each attrs[i] (ie component), attrvalues[i] (star01)
                    # we need to look for this parameter, and if it does not exist
                    # then create it by copying param


                    for attr, attrvalue in zip(attrs, attrvalues):
                        #if attrvalue=='_default' and not getattr(param, attr):
                        #    print "SKIPPING", attr, attrvalue
                        #    continue
                        metawargs[attr] = attrvalue

                    # logger.debug("_check_copy_for {}: metawargs={}".format(param.twig, metawargs))
                    if not len(self._bundle.filter(check_visible=False, **metawargs)):
                        # then we need to make a new copy
                        logger.debug("copying '{}' parameter for {}".format(param.qualifier, {attr: attrvalue for attr, attrvalue in zip(attrs, attrvalues)}))

                        newparam = param.copy()

                        for attr, attrvalue in zip(attrs, attrvalues):
                            setattr(newparam, '_{}'.format(attr), attrvalue)

                        newparam._copy_for = False
                        if newparam._visible_if and newparam._visible_if.lower() == 'false':
                            newparam._visible_if = None
                        newparam._bundle = self._bundle

                        self._params.append(newparam)


                    # Now we need to handle copying constraints.  This can't be
                    # in the previous if statement because the parameters can be
                    # copied before constraints are ever attached.
                    if hasattr(param, 'is_constraint') and param.is_constraint:

                        param_constraint = param.is_constraint

                        copied_param = self._bundle.get_parameter(check_visible=False, check_default=False, **metawargs)

                        if not copied_param.is_constraint:
                            constraint_kwargs = param_constraint.constraint_kwargs.copy()
                            for attr, attrvalue in zip(attrs, attrvalues):
                                if attr in constraint_kwargs.keys():
                                    constraint_kwargs[attr] = attrvalue

                            logger.debug("copying constraint '{}' parameter for {}".format(param_constraint.constraint_func, {attr: attrvalue for attr, attrvalue in zip(attrs, attrvalues)}))
                            self.add_constraint(func=param_constraint.constraint_func, **constraint_kwargs)

        return