<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _get_site_info(self):
 """ Parse out the Wikimedia site information including API Version and Extensions """

        response = self.wiki_request(
            {"meta": "siteinfo", "siprop": "extensions|general"}
        )

        # parse what we need out here!
        query = response.get("query", None)
        if query is None or query.get("general", None) is None:
            raise MediaWikiException("Missing query in response")

        gen = query.get("general", None)

        api_version = gen["generator"].split(" ")[1].split("-")[0]

        major_minor = api_version.split(".")
        for i, item in enumerate(major_minor):
            major_minor[i] = int(item)
        self._api_version = tuple(major_minor)
        self._api_version_str = ".".join([str(x) for x in self._api_version])

        # parse the base url out
        tmp = gen.get("server", "")
        if tmp == "":
            raise MediaWikiException("Unable to parse base url")
        if tmp.startswith("http://") or tmp.startswith("https://"):
            self._base_url = tmp
        elif gen["base"].startswith("https:"):
            self._base_url = "https:{}".format(tmp)
        else:
            self._base_url = "http:{}".format(tmp)

        self._extensions = [ext["name"] for ext in query["extensions"]]
        self._extensions = sorted(list(set(self._extensions)))