How to use the textblob.nltk.corpus.reader.framenet.PrettyList function in textblob

def _handle_lexunit_elt(self, elt, ignorekeys):
        """
        Load full info for a lexical unit from its xml file. 
        This should only be called when accessing corpus annotations 
        (which are not included in frame files).
        """
        luinfo = self._load_xml_attributes(AttrDict(), elt)
        luinfo['_type'] = 'lu'
        luinfo['definition'] = ""
        luinfo['subCorpus'] = PrettyList()
        luinfo['lexemes'] = PrettyList()   # multiword LUs have multiple lexemes
        luinfo['semTypes'] = PrettyList()  # an LU can have multiple semtypes
        for k in ignorekeys:
            if k in luinfo:
                del luinfo[k]

        for sub in elt:
            if sub.tag.endswith('header'):
                continue  # not used
            elif sub.tag.endswith('valences'):
                continue  # not used
            elif sub.tag.endswith('definition') and 'definition' not in ignorekeys:
                luinfo['definition'] = self._strip_tags(sub.text)
            elif sub.tag.endswith('subCorpus') and 'subCorpus' not in ignorekeys:
                sc = self._handle_lusubcorpus_elt(sub)
                if sc is not None:

rels = self._frel_idx.values()
        
        # filter by 'frame2'
        if frame2 is not None:
            if frame is None:
                raise FramenetError("frame_relations(frame=None, frame2=) is not allowed")
            if not isinstance(frame2, int):
                if isinstance(frame2, dict):
                    frame2 = frame2.ID
                else:
                    frame2 = self.frame_by_name(frame2).ID
            if frame==frame2:
                raise FramenetError("The two frame arguments to frame_relations() must be different frames")
            rels = [rel for rel in rels if rel.superFrame.ID==frame2 or rel.subFrame.ID==frame2]
        
        return PrettyList(sorted(rels, 
                key=lambda frel: (frel.type.ID, frel.superFrameName, frel.subFrameName)))

frinfo['semTypes'] = []
        for k in ignorekeys:
            if k in frinfo:
                del frinfo[k]

        for sub in elt:
            if sub.tag.endswith('definition') and 'definition' not in ignorekeys:
                frinfo['definition'] = self._strip_tags(sub.text)
            elif sub.tag.endswith('FE') and 'FE' not in ignorekeys:
                feinfo = self._handle_fe_elt(sub)
                frinfo['FE'][feinfo.name] = feinfo
                feinfo['frame'] = frinfo    # backpointer
            elif sub.tag.endswith('FEcoreSet') and 'FEcoreSet' not in ignorekeys:
                coreset = self._handle_fecoreset_elt(sub)
                # assumes all FEs have been loaded before coresets
                frinfo['FEcoreSets'].append(PrettyList(frinfo['FE'][fe.name] for fe in coreset))
            elif sub.tag.endswith('lexUnit') and 'lexUnit' not in ignorekeys:
                luentry = self._handle_framelexunit_elt(sub)
                if luentry['status'] in self._bad_statuses:
                    # problematic LU entry; ignore it
                    continue
                luentry['frame'] = frinfo
                luentry['subCorpus'] = Future((lambda lu: lambda: self._lu_file(lu))(luentry))
                frinfo['lexUnit'][luentry.name] = luentry
                if not self._lu_idx:
                    self._buildluindex()
                self._lu_idx[luentry.ID] = luentry
            elif sub.tag.endswith('semType') and 'semTypes' not in ignorekeys:
                semtypeinfo = self._load_xml_attributes(AttrDict(), sub)
                frinfo['semTypes'].append(self.semtype(semtypeinfo.ID))

        frinfo['frameRelations'] = self.frame_relations(frame=frinfo)

scon - subordinating conjunction

        :type name: str
        :return: A list of selected (or all) lexical units
        :rtype: list of LU objects (dicts). See the lu() function for info
          about the specifics of LU objects.

        """
        try:
            luIDs = list(self._lu_idx.keys())
        except AttributeError:
            self._buildluindex()
            luIDs = list(self._lu_idx.keys())
        
        if name is not None:
            return PrettyList(self.lu(luID) for luID,luName in self.lu_ids_and_names(name).items())
        else:
            return PrettyLazyMap(self.lu, luIDs)

def _buildrelationindex(self):
        #print('building relation index...', file=sys.stderr)
        freltypes = PrettyList(x for x in XMLCorpusView(self.abspath("frRelation.xml"),
                                            'frameRelations/frameRelationType',
                                            self._handle_framerelationtype_elt))
        self._freltyp_idx = {}
        self._frel_idx = {}
        self._frel_f_idx = defaultdict(set)
        self._ferel_idx = {}
        
        for freltyp in freltypes:
            self._freltyp_idx[freltyp.ID] = freltyp
            for frel in freltyp.frameRelations:
                supF = frel.superFrame = frel[freltyp.superFrameName] = Future((lambda fID: lambda: self.frame_by_id(fID))(frel.supID))
                subF = frel.subFrame = frel[freltyp.subFrameName] = Future((lambda fID: lambda: self.frame_by_id(fID))(frel.subID))
                self._frel_idx[frel.ID] = frel
                self._frel_f_idx[frel.supID].add(frel.ID)
                self._frel_f_idx[frel.subID].add(frel.ID)
                for ferel in frel.feRelations:

def _handle_semtype_elt(self, elt, tagspec=None):
        semt = self._load_xml_attributes(AttrDict(), elt)
        semt['_type'] = 'semtype'
        semt['superType'] = None
        semt['subTypes'] = PrettyList()
        for sub in elt:
            if sub.text is not None:
                semt['definition'] = self._strip_tags(sub.text)
            else:
                supertypeinfo = self._load_xml_attributes(AttrDict(), sub)
                semt['superType'] = supertypeinfo
                # the supertype may not have been loaded yet

        return semt

the "lemma" part can be made up of either a single lexeme
        (e.g. 'run') or multiple lexemes (e.g. 'a little').

        Note: if you are going to be doing a lot of this type of
        searching, you'd want to build an index that maps from lemmas to
        frames because each time frames_by_lemma() is called, it has to
        search through ALL of the frame XML files in the db.

        >>> from nltk.corpus import framenet as fn
        >>> fn.frames_by_lemma(r'(?i)a little')
        [, ]

        :return: A list of frame objects.
        :rtype: list(AttrDict)
        """
        return PrettyList(f for f in self.frames() if any(re.search(pat, luName) for luName in f.lexUnit))

relation_type = type

        if not self._frel_idx:
            self._buildrelationindex()
        
        rels = None
        
        if relation_type is not None:
            if not isinstance(relation_type, dict):
                type = [rt for rt in self.frame_relation_types() if rt.name==type][0]
                assert isinstance(type,dict)
        
        # lookup by 'frame'
        if frame is not None:
            if isinstance(frame,dict) and 'frameRelations' in frame:
                rels = PrettyList(frame.frameRelations)
            else:
                if not isinstance(frame, int):
                    if isinstance(frame, dict):
                        frame = frame.ID
                    else:
                        frame = self.frame_by_name(frame).ID
                rels = [self._frel_idx[frelID] for frelID in self._frel_f_idx[frame]]
        
            # filter by 'type'
            if type is not None:
                rels = [rel for rel in rels if rel.type is type]
        elif type is not None:
            # lookup by 'type'
            rels = type.frameRelations
        else:
            rels = self._frel_idx.values()

def _handle_framelexunit_elt(self, elt):
        """Load the lexical unit info from an xml element in a frame's xml file."""
        luinfo = AttrDict()
        luinfo['_type'] = 'lu'
        luinfo = self._load_xml_attributes(luinfo, elt)
        luinfo["definition"] = ""
        luinfo["sentenceCount"] = PrettyDict()
        luinfo['lexemes'] = PrettyList()   # multiword LUs have multiple lexemes
        luinfo['semTypes'] = PrettyList()  # an LU can have multiple semtypes

        for sub in elt:
            if sub.tag.endswith('definition'):
                luinfo['definition'] = self._strip_tags(sub.text)
            elif sub.tag.endswith('sentenceCount'):
                luinfo['sentenceCount'] = self._load_xml_attributes(
                    PrettyDict(), sub)
            elif sub.tag.endswith('lexeme'):
                luinfo['lexemes'].append(self._load_xml_attributes(PrettyDict(), sub))
            elif sub.tag.endswith('semType'):
                semtypeinfo = self._load_xml_attributes(PrettyDict(), sub)
                luinfo['semTypes'].append(self.semtype(semtypeinfo.ID))

        return luinfo

def _handle_framerelationtype_elt(self, elt, *args):
        """Load frame-relation element and its child fe-relation elements from frRelation.xml."""
        info = self._load_xml_attributes(AttrDict(), elt)
        info['_type'] = 'framerelationtype'
        info['frameRelations'] = PrettyList()
        
        for sub in elt:
            if sub.tag.endswith('frameRelation'):
                frel = self._handle_framerelation_elt(sub)
                frel['type'] = info   # backpointer
                for ferel in frel.feRelations:
                    ferel['type'] = info
                info['frameRelations'].append(frel)

        return info