Fix imports and general cleanup

· Import from compat what comes from compat. Yes, some names are available in utils too, but that's an implementation detail.
· Use _match_id consistently whenever possible
· Fix some outdated tests
· Use consistent valid URL (always match the whole protocol, no ^ at start required)
· Use modern test definitions

1 files changed, 7 insertions, 4 deletions

diff --git a/youtube_dl/extractor/vk.py b/youtube_dl/extractor/vk.py
index ca6b0d5b3..542e9198a 100644
--- a/youtube_dl/extractor/vk.py
+++ b/youtube_dl/extractor/vk.py
@@ -5,14 +5,17 @@ import re
 import json
 
 from .common import InfoExtractor
+from ..compat import (
+    compat_str,
+    compat_urllib_parse,
+    compat_urllib_request,
+)
 from ..utils import (
     ExtractorError,
-    compat_urllib_request,
-    compat_urllib_parse,
-    compat_str,
+    orderedSet,
     unescapeHTML,
     unified_strdate,
-    orderedSet)
+)
 
 
 class VKIE(InfoExtractor):