Introduction to Python

Manage the Shopping Cart

Given an empty shopping cart, you are asked to implement a manage_cart function that would be called n times to modify and view the shopping cart. There are 3 allowed operations:

  • add: Add an item to the cart (an item is a string). If the item is already in the cart, the program should print <ITEM> is already in the cart.

  • remove: Remove an item from the cart (an item is a string). If the item is not in the cart, the program should print <ITEM> was not found.

  • view: Print Current cart: <ITEM1>, <ITEM2>, .... If the cart is empty, it should just print Current cart: .

Here <ITEM>, <ITEM1>, and <ITEM2> are the items (the strings) currently in the shopping cart or passed as an argument.

The manage_cart function should have 2 parameters:

  1. operation (positional): One of add, remove, or view.

  2. item։ An optional keyword argument that defaults to None.

Tip

Store a global cart variable that would store the current contents of the cart.

Input

Output

2 add Banana view

Current cart: Banana

7 add Apple add Banana view remove Apple add Banana view remove Apple

Current cart: Apple, Banana Banana is already in the cart Current cart: Banana Apple was not found

Constraints

Time limit: 2 seconds

Memory limit: 512 MB

Output limit: 1 MB

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