How to use the oauthlib.common.urlencode function in oauthlib

def _extract_params(self, request):
        log.debug('Extracting parameters from request.')
        uri = request.build_absolute_uri()
        http_method = request.method
        headers = request.META
        if 'wsgi.input' in headers:
            del headers['wsgi.input']
        if 'wsgi.errors' in headers:
            del headers['wsgi.errors']
        if 'HTTP_AUTHORIZATION' in headers:
            headers['Authorization'] = headers['HTTP_AUTHORIZATION']
        body = urlencode(request.POST.items())
        return uri, http_method, body, headers

# TODO: right now these prepare_* methods are very narrow in scope--they
        # only affect their little thing. In some cases (for example, with
        # header auth) it might be advantageous to allow these methods to touch
        # other parts of the request, like the headers—so the prepare_headers
        # method could also set the Content-Type header to x-www-form-urlencoded
        # like the spec requires. This would be a fundamental change though, and
        # I'm not sure how I feel about it.
        if self.signature_type == SIGNATURE_TYPE_AUTH_HEADER:
            headers = parameters.prepare_headers(
                request.oauth_params, request.headers, realm=realm)
        elif self.signature_type == SIGNATURE_TYPE_BODY and request.decoded_body is not None:
            body = parameters.prepare_form_encoded_body(
                request.oauth_params, request.decoded_body)
            if formencode:
                body = urlencode(body)
            headers['Content-Type'] = 'application/x-www-form-urlencoded'
        elif self.signature_type == SIGNATURE_TYPE_QUERY:
            uri = parameters.prepare_request_uri_query(
                request.oauth_params, request.uri)
        else:
            raise ValueError('Unknown signature type specified.')

        return uri, headers, body

:param request: OAuthlib request.
        :type request: oauthlib.common.Request
        :returns: The token as an urlencoded string.
        """
        request.realms = self.request_validator.get_realms(
            request.resource_owner_key, request)
        token = {
            'oauth_token': self.token_generator(),
            'oauth_token_secret': self.token_generator(),
            # Backport the authorized scopes indication used in OAuth2
            'oauth_authorized_realms': ' '.join(request.realms)
        }
        token.update(credentials)
        self.request_validator.save_access_token(token, request)
        return urlencode(token.items())

uri, headers, body = request.uri, request.headers, request.body

        # TODO: right now these prepare_* methods are very narrow in scope--they
        # only affect their little thing. In some cases (for example, with
        # header auth) it might be advantageous to allow these methods to touch
        # other parts of the request, like the headers—so the prepare_headers
        # method could also set the Content-Type header to x-www-form-urlencoded
        # like the spec requires. This would be a fundamental change though, and
        # I'm not sure how I feel about it.
        if self.signature_type == SIGNATURE_TYPE_AUTH_HEADER:
            headers = parameters.prepare_headers(request.oauth_params, request.headers)
        elif self.signature_type == SIGNATURE_TYPE_BODY and request.decoded_body is not None:
            body = parameters.prepare_form_encoded_body(request.oauth_params, request.decoded_body)
            if formencode:
                body = urlencode(body)
            headers['Content-Type'] = u'application/x-www-form-urlencoded'
        elif self.signature_type == SIGNATURE_TYPE_QUERY:
            uri = parameters.prepare_request_uri_query(request.oauth_params, request.uri)
        else:
            raise ValueError('Unknown signature type specified.')

        return uri, headers, body

def _extract_params(self):
        log.debug('Extracting parameters from request.')
        uri = request.url
        http_method = request.method
        headers = dict(request.headers)
        if 'wsgi.input' in headers:
            del headers['wsgi.input']
        if 'wsgi.errors' in headers:
            del headers['wsgi.errors']
        if 'HTTP_AUTHORIZATION' in headers:
            headers['Authorization'] = headers['HTTP_AUTHORIZATION']
        body = urlencode(request.form.items())
        return uri, http_method, body, headers

def urlencoded(self):
        return urlencode(self.twotuples)

def create_request_token(self, request, credentials):
        """Create and save a new request token.

        :param request: OAuthlib request.
        :type request: oauthlib.common.Request
        :param credentials: A dict of extra token credentials.
        :returns: The token as an urlencoded string.
        """
        token = {
            'oauth_token': self.token_generator(),
            'oauth_token_secret': self.token_generator(),
            'oauth_callback_confirmed': 'true'
        }
        token.update(credentials)
        self.request_validator.save_request_token(token, request)
        return urlencode(token.items())

def _extract_params(self, request):
        """
        Extract parameters from the Django request object.
        Such parameters will then be passed to OAuthLib to build its own
        Request object. The body should be encoded using OAuthLib urlencoded.
        """
        uri = self._get_escaped_full_path(request)
        http_method = request.method
        headers = self.extract_headers(request)
        body = urlencode(self.extract_body(request))
        return uri, http_method, body, headers

def _extract_params(self, request, post_dict):
        """
        Extract parameters from the Django request object. Such parameters will then be passed to
        OAuthLib to build its own Request object
        """
        uri = self._get_escaped_full_path(request)
        http_method = request.httprequest.method

        headers = dict(list(request.httprequest.headers.items()))
        if 'wsgi.input' in headers:
            del headers['wsgi.input']
        if 'wsgi.errors' in headers:
            del headers['wsgi.errors']
        if 'HTTP_AUTHORIZATION' in headers:
            headers['Authorization'] = headers['HTTP_AUTHORIZATION']
        body = urlencode(list(post_dict.items()))
        return uri, http_method, body, headers

def prepare_request_uri_query(oauth_params, uri):
    """Prepare the Request URI Query.

    Per `section 3.5.3`_ of the spec.

    .. _`section 3.5.3`: http://tools.ietf.org/html/rfc5849#section-3.5.3

    """
    # append OAuth params to the existing set of query components
    sch, net, path, par, query, fra = urlparse(uri)
    query = urlencode(_append_params(oauth_params, extract_params(query) or []))
    return urlunparse((sch, net, path, par, query, fra))