chapter 2.1 calculator project setup

calculator/main.py

@@ -0,0 +1,22 @@
+import sys
+from pkg.calculator import Calculator
+from pkg.render import render
+
+def main():
+    calculator = Calculator()
+    if len(sys.argv) <= 1:
+        print("Calculator App")
+        print("Usage: python main.py \"<expression>\"")
+        print("Example: python main.py \"3 + 5\"")
+        return
+
+    expression = " ".join(sys.argv[1:])
+    try:
+        result = calculator.evaluate(expression)
+        to_print = render(expression, result)
+        print(to_print)
+    except Exception as e:
+        print(f"Error: {e}")
+
+if __name__ == "__main__":
+    main()