diff --git a/devscripts/make_lazy_extractors.py b/devscripts/make_lazy_extractors.py
index ad9750231..0ce773e82 100644
--- a/devscripts/make_lazy_extractors.py
+++ b/devscripts/make_lazy_extractors.py
@@ -75,8 +75,7 @@ def build_ies(ies, bases, attr_base):
         if ie in ies:
             names.append(ie.__name__)
 
-    class_lookup_contents = ', '.join(f'{name!r}: {name}' for name in names)
-    yield f'\n_CLASS_LOOKUP = {{ {class_lookup_contents} }}'
+    yield '\n_CLASS_LOOKUP = {%s}' % ', '.join(f'{name!r}: {name}' for name in names)
 
 
 def sort_ies(ies, ignored_bases):
diff --git a/pyproject.toml b/pyproject.toml
index f5764d702..a8820d089 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -384,7 +384,7 @@ select = [
     "W391",
     "W504",
     ]
-exclude = "**/yt_dlp/extractor/lazy_extractors.py"
+exclude = "**/yt_dlp/extractor/lazy_extractors.py,*venv*"
 
 [tool.pytest.ini_options]
 addopts = "-ra -v --strict-markers"