How to use the wikiextractor.WikiExtractor function in wikiextractor

self["id"] = wiki_document.id,
        self["url"] = wiki_document.url
        self["text"] = wiki_document.text 

    def setAnnotations(self, annotations):
        self["annotations"] = annotations
        
    def __str__(self):
        return json.dumps(self) + "\n"

"""
An extended version of the WikiExtrator. Output is in JSON format and annotations
are added for links in the article. See README.md for more information about the
JSON format.
"""
class AnnotatedWikiExtractor (wikiextractor.WikiExtractor):

    def __init__(self):
        wikiextractor.prefix = ''
        wikiextractor.WikiExtractor.__init__(self)

    def extract(self, wiki_document):
        annotations = []
        
        #Extract the article using the general WikiExtractor:
        wiki_document = wikiextractor.WikiExtractor.extract(self, wiki_document)
        if not wiki_document: return None
        
        #This int is used to keep track of the difference between the original article with <a href="..">
        #links and the new article that only contains the label of the link.
        deltaStringLength = 0
        </a>

self["id"] = wiki_document.id,
        self["url"] = wiki_document.url
        self["text"] = wiki_document.text 

    def setAnnotations(self, annotations):
        self["annotations"] = annotations
        
    def __str__(self):
        return json.dumps(self) + "\n"

"""
An extended version of the WikiExtrator. Output is in JSON format and annotations
are added for links in the article. See README.md for more information about the
JSON format.
"""
class AnnotatedWikiExtractor (wikiextractor.WikiExtractor):

    def __init__(self):
        wikiextractor.prefix = 'http://en.wikipedia.org/wiki/'
        wikiextractor.WikiExtractor.__init__(self)

    def extract(self, wiki_document):
        annotations = []
        
        #Extract the article using the general WikiExtractor:
        wiki_document = wikiextractor.WikiExtractor.extract(self, wiki_document)
        if not wiki_document: return None
        
        #This int is used to keep track of the difference between the original article with <a href="..">
        #links and the new article that only contains the label of the link.
        deltaStringLength = 0
        </a>