Remove Python 3 syntax

scrapy/downloadermiddlewares/cookies.py

@@ -35,7 +35,7 @@ class CookiesMiddleware(object):
             raise NotConfigured
         return cls(crawler.settings.getbool('COOKIES_DEBUG'))
 
-    def _process_cookies(self, cookies, *, jar, request):
+    def _process_cookies(self, cookies, jar, request):
         for cookie in cookies:
             cookie_domain = cookie.domain
             if cookie_domain.startswith('.'):

scrapy/downloadermiddlewares/redirect.py

@@ -14,8 +14,8 @@ logger = logging.getLogger(__name__)
 def _build_redirect_request(source_request, url, **kwargs):
     redirect_request = source_request.replace(
         url=url,
-        **kwargs,
         cookies=None,
+        **kwargs,
     )
     if 'Cookie' in redirect_request.headers:
         source_request_netloc = urlparse_cached(source_request).netloc

tests/test_downloadermiddleware_cookies.py

@@ -30,9 +30,9 @@ def _cookie_to_set_cookie_value(cookie):
             except UnicodeDecodeError:
                 decoded[key] = cookie[key].decode("latin1", errors="replace")
 
-    cookie_str = f"{decoded.pop('name')}={decoded.pop('value')}"
+    cookie_str = "{}={}".format(decoded.pop('name'), decoded.pop('value'))
     for key, value in decoded.items():  # path, domain
-        cookie_str += f"; {key.capitalize()}={value}"
+        cookie_str += "; {}={}".format(key.capitalize(), value)
     return cookie_str