first commit

calculator.py

@@ -0,0 +1,14 @@
+def add(a, b):
+    return a + b
+
+def subtract(a, b):
+    return a - b
+
+def multiply(a, b):
+    return a * b
+
+def divide(a, b):
+    if b == 0:
+        raise ValueError("Cannot divide by zero")
+    return a / b
+