Revert "Delete .venv directory"

This reverts commit 5a2693bd9f.

.venv/lib/python3.9/site-packages/multidict/_compat.py

@@ -0,0 +1,14 @@
+import os
+import platform
+
+NO_EXTENSIONS = bool(os.environ.get("MULTIDICT_NO_EXTENSIONS"))
+
+PYPY = platform.python_implementation() == "PyPy"
+
+USE_CYTHON_EXTENSIONS = USE_CYTHON = not NO_EXTENSIONS and not PYPY
+
+if USE_CYTHON_EXTENSIONS:
+    try:
+        from . import _multidict  # noqa
+    except ImportError:
+        USE_CYTHON_EXTENSIONS = USE_CYTHON = False