Speedup tok.

1 files changed, 5 insertions, 6 deletions

diff --git a/rdflib/plugins/parsers/notation3.py b/rdflib/plugins/parsers/notation3.py
index 4bb6b5df..3cf19ace 100755
--- a/rdflib/plugins/parsers/notation3.py
+++ b/rdflib/plugins/parsers/notation3.py
@@ -510,14 +510,13 @@ class SinkParser:
             if tok not in self.keywords:
                 return -1  # No, this has neither keywords declaration nor "@"
 
-        len_tok = len(tok)
+        i_plus_len_tok = i + len(tok)
         if (
-            argstr[i : i + len_tok] == tok
-            and (argstr[i + len_tok] in _notKeywordsChars)
-            or (colon and argstr[i + len_tok] == ":")
+            argstr[i : i_plus_len_tok] == tok
+            and (argstr[i_plus_len_tok] in _notKeywordsChars)
+            or (colon and argstr[i_plus_len_tok] == ":")
         ):
-            i += len_tok
-            return i
+            return i_plus_len_tok
         else:
             return -1