Add unit tests for calculator

calculator/lib/python3.12/site-packages/flake8/_compat.py

@@ -0,0 +1,18 @@
+from __future__ import annotations
+
+import sys
+import tokenize
+
+if sys.version_info >= (3, 12):  # pragma: >=3.12 cover
+    FSTRING_START = tokenize.FSTRING_START
+    FSTRING_MIDDLE = tokenize.FSTRING_MIDDLE
+    FSTRING_END = tokenize.FSTRING_END
+else:  # pragma: <3.12 cover
+    FSTRING_START = FSTRING_MIDDLE = FSTRING_END = -1
+
+if sys.version_info >= (3, 14):  # pragma: >=3.14 cover
+    TSTRING_START = tokenize.TSTRING_START
+    TSTRING_MIDDLE = tokenize.TSTRING_MIDDLE
+    TSTRING_END = tokenize.TSTRING_END
+else:  # pragma: <3.14 cover
+    TSTRING_START = TSTRING_MIDDLE = TSTRING_END = -1