Part 8: Drop things

In this section we’ll add the drop command.

Part 8.1: Add command

source code

In this section we’ll define a do_drop() function that gets called when the player types drop.

Demo

A: Define do_drop()

1. [ ] Define a do_drop() function.

2. [ ] In it, use the debug() function to print something like "Trying to drop args.".

Code

def do_drop(args):
    """Remove an item from inventory"""

    debug(f"Trying to drop: {args}.")

B: Modify main(), in the while loop

1. [ ] Add an elif that checks if command is "drop".

   • [ ] if so, call do_drop() and pass args.

Code

        if command in ("q", "quit", "exit"):
            do_quit()

        elif command in ("shop"):
            do_shop()

        elif command in ("g", "go"):
            do_go(args)

        elif command in ("x", "exam", "examine"):
            do_examine(args)

        elif command in ("l", "look"):
            do_look()

        elif command in ("t", "take", "grab"):
            do_take(args)

        elif command in ("i", "inventory"):
            do_inventory()

        elif command == "drop":
            do_drop(args)

        else:
            error("No such command.")
            continue

Part 8.2: Validate

source code

In this section we’ll check to make sure that the player entered an item they have in inventory.

Demo

A: Modify do_drop()

1. [ ] Check to see if args is falsy, if so:

   • [ ] Use the error() function to print a message saying:

     "What do you want to drop?"

   • [ ] return

2. [ ] assign the first item of the args list to the variable name and make it lowercase

3. [ ] Check if name is not in PLAYER["inventory"] or if PLAYER["inventory"][name] is falsy. If so:

   • [ ] Use the error() function to print a message saying:

     "You don't have any name."

   • [ ] return

Code

def do_drop(args):
    """Remove an item from inventory"""

    debug(f"Trying to drop: {args}.")

    # make sure the player typed an item
    if not args:
        error("What do you want to drop?")
        return

    # get the item name from arguments
    # and make it lowercase
    name = args[0].lower()

    # make sure the item is in inventory
    if name not in PLAYER["inventory"] or not PLAYER["inventory"][name]:
        error(f"You don't have any {name!r}.")
        return

Part 8.3: Drop it

source code

In this section we’ll check remove the item from the players inventory and add it to the place items.

Demo

A: Modify do_drop(): remove from inventory

1. [ ] subtract 1 from PLAYER["inventory"][name]

2. [ ] remove item from inventory if the quantity is 0 by:

   if PLAYER["inventory"][name] is falsy:

   • [ ] call .pop() on PLAYER["inventory"] with the argument name

Code

def do_drop(args):
    """Remove an item from inventory"""

    debug(f"Trying to drop: {args}.")

    # make sure the player typed an item
    if not args:
        error("What do you want to drop?")
        return

    # get the item name from arguments
    # and make it lowercase
    name = args[0].lower()

    # make sure the item is in inventory
    if name not in PLAYER["inventory"] or not PLAYER["inventory"][name]:
        error(f"You don't have any {name!r}.")
        return

    # remove from inventory
    PLAYER["inventory"][name] -= 1
    if not PLAYER["inventory"][name]:
        PLAYER["inventory"].pop(name)

B: Modify do_drop(): add to place

1. [ ] get the value from PLAYER associated with the "place" key and assign it to place_name

2. [ ] get the value from PLACES associated with place_name and assign it to place

3. [ ] call .setdefault() on place with the argument "items" and []

4. [ ] append name to place["items"]

5. [ ] print a message using the wrap() function like: You set down the name.

Code

def do_drop(args):
    """Remove an item from inventory"""

    debug(f"Trying to drop: {args}.")

    # make sure the player typed an item
    if not args:
        error("What do you want to drop?")
        return

    # get the item name from arguments
    # and make it lowercase
    name = args[0].lower()

    # make sure the item is in inventory
    if name not in PLAYER["inventory"] or not PLAYER["inventory"][name]:
        error(f"You don't have any {name!r}.")
        return

    # remove from inventory
    PLAYER["inventory"][name] -= 1
    if not PLAYER["inventory"][name]:
        PLAYER["inventory"].pop(name)

    # look up where the player is now
    place_name = PLAYER["place"]
    place = PLACES[place_name]

    # add to place items
    place.setdefault("items", [])
    place["items"].append(name)

    # print a message
    wrap(f"You set down the {name}.")