Add test cases

shared/notes-and-examples/2026.04.08/homework.py

@@ -12,3 +12,26 @@
 # Start with the "innermost" expression and work backwards (this is the recursion part)
 #
 # For help, email me@bchen.dev
+
+# Use this function definition:
+def rpn(expression: list[str]) -> int:
+    return 0
+
+
+# The following test cases should pass (please copy this into your code):
+tests = [
+    (["3", "2", "+"], 5),
+    (["3", "4", "*"], 12),
+    (["3", "4", "2", "+", "*"], 18),
+    ([], 0),
+    (["50", "2", "/"], 25),
+    (["5", "2", "/"], 2),  # for division, cast to int using int(num)
+    (["5", "4", "3", "-", "*"], 5),
+]
+for case in tests:
+    result = rpn(case[0])
+    expected = case[1]
+    if result == expected:
+        print(f"PASS: expected {expected}, got {result} for {case[0]}")
+    else:
+        print(f"FAIL: expected {expected}, got {result} for {case[0]}")