diff --git a/tests/test_url.py b/tests/test_url.py
index f969cff..319d76c 100644
--- a/tests/test_url.py
+++ b/tests/test_url.py
@@ -1386,7 +1386,8 @@ def test_domains_are_case_insensitive(self):
 
     def test_userinfo_is_case_sensitive(self):
         self.assertEqual(
-            canonicalize_url("sftp://UsEr:PaSsWoRd@www.EXAMPLE.com/"), "sftp://UsEr:PaSsWoRd@www.example.com/"
+            canonicalize_url("sftp://UsEr:PaSsWoRd@www.EXAMPLE.com/"),
+            "sftp://UsEr:PaSsWoRd@www.example.com/",
         )
 
     def test_canonicalize_idns(self):
diff --git a/w3lib/url.py b/w3lib/url.py
index bb6486c..c142048 100644
--- a/w3lib/url.py
+++ b/w3lib/url.py
@@ -660,9 +660,7 @@ def canonicalize_url(
     netloc = "@".join(netloc_parts)
 
     # every part should be safe already
-    return urlunparse(
-        (scheme, netloc, path, params, query, fragment)
-    )
+    return urlunparse((scheme, netloc, path, params, query, fragment))
 
 
 def _unquotepath(path: str) -> bytes: