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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 filter_cookies(self, request_url: URL=URL()) -> 'BaseCookie[str]': """Returns this jar's cookies filtered by their attributes."""

        self._do_expiration()
        request_url = URL(request_url)
        filtered = SimpleCookie()
        hostname = request_url.raw_host or ""
        is_not_secure = request_url.scheme not in ("https", "wss")

        for cookie in self:
            name = cookie.key
            domain = cookie["domain"]

            # Send shared cookies
            if not domain:
                filtered[name] = cookie.value
                continue

            if not self._unsafe and is_ip_address(hostname):
                continue

            if (domain, name) in self._host_only_cookies:
                if domain != hostname:
                    continue
            elif not self._is_domain_match(domain, hostname):
                continue

            if not self._is_path_match(request_url.path, cookie["path"]):
                continue

            if is_not_secure and cookie["secure"]:
                continue

            # It's critical we use the Morsel so the coded_value
            # (based on cookie version) is preserved
            mrsl_val = cast('Morsel[str]', cookie.get(cookie.key, Morsel()))
            mrsl_val.set(cookie.key, cookie.value, cookie.coded_value)
            filtered[name] = mrsl_val

        return filtered