UPDATE

main.py

-print('欢迎来到 InsCode ! Hello world!')
\ No newline at end of file
+print('欢迎来到 InsCode ! Hello world!')
+
+def add(x, y):
+    return x + y
+
+def subtract(x, y):
+    return x - y
+
+def multiply(x, y):
+    return x * y
+
+def divide(x, y):
+    return x / y
+
+print("选择运算：")
+print("1、加")
+print("2、减")
+print("3、乘")
+print("4、除")
+
+choice = input("输入你的选择（1/2/3/4):")
+
+num1 = float(input("输入第一个数字: "))
+num2 = float(input("输入第二个数字: "))
+
+if choice == '1':
+    print(num1,"+",num2,"=", add(num1,num2))
+
+elif choice == '2':
+    print(num1,"-",num2,"=", subtract(num1,num2))
+
+elif choice == '3':
+    print(num1,"*",num2,"=", multiply(num1,num2))
+
+elif choice == '4':
+    print(num1,"/",num2,"=", divide(num1,num2))
+else:
+    print("非法输入")