Add basic Python calculator

main.py

@@ -0,0 +1,29 @@
+def calculate(a, b, operation):
+    if operation == "+":
+        return a + b
+    if operation == "-":
+        return a - b
+    if operation == "*":
+        return a * b
+    if operation == "/":
+        if b == 0:
+            raise ValueError("Division by zero is not allowed")
+        return a / b
+    raise ValueError(f"Unsupported operation: {operation}")
+
+
+def main():
+    print("Simple Python Calculator")
+    first = float(input("Enter the first number: "))
+    operation = input("Choose operation (+, -, *, /): ").strip()
+    second = float(input("Enter the second number: "))
+
+    try:
+        result = calculate(first, second, operation)
+        print(f"Result: {result}")
+    except ValueError as error:
+        print(f"Error: {error}")
+
+
+if __name__ == "__main__":
+    main()