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I am trying to make an inventory program to use in an RPG. The program needs to be able to add and remove things and then add them to a list. This is what I have so far:
inventory=["sword","potion","armour","bow"] print(inventory) print("\ncommands: use (remove) and pickup (add)") selection=input("choose a command [use/pickup]") if selection=="use": print(inventory) remove=input("What do you want to use? ") inventory.remove(remove) print(inventory) elif selection=="pickup": print(inventory) add=input("What do you want to pickup? ") newinv=inventory+str(add) print(newinv) When I run this and try to pick something up, I get this error:
Traceback (most recent call last): File "H:/Year 10/Computing/A453/Python Programs/inventory.py", line 15, in <module> newinv=inventory+str(add) TypeError: can only concatenate list (not "str") to list Does any one have a fix for this, it would be greatly appreciated.
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The “TypeError: can only concatenate list (not “int”) to list” error is raised when you try to concatenate an integer to a list. This error is raised because only lists can be concatenated to lists. To solve this error, use the append() method to add an item to a list.
The Python "TypeError: can only concatenate str (not "list") to str" occurs when we try to concatenate a string and a list. To solve the error, access the list at a specific index to concatenate two strings, or use the append() method to add an item to the list. Here is an example of how the error occurs. Copied!
The Python "TypeError: can only concatenate str (not "int") to str" occurs when we try to concatenate a string and an integer. To solve the error, convert the int to a string, e.g. str(my_int) to concatenate the strings or convert the str to an int, e.g. int(my_str) to add the numbers.
Python's extend() method can be used to concatenate two lists in Python. The extend() function does iterate over the passed parameter and adds the item to the list thus, extending the list in a linear fashion. All the elements of the list2 get appended to list1 and thus the list1 gets updated and results as output.
I think what you want to do is add a new item to your list, so you have change the line newinv=inventory+str(add) with this one:
newinv = inventory.append(add) What you are doing now is trying to concatenate a list with a string which is an invalid operation in Python.
However I think what you want is to add and delete items from a list, in that case your if/else block should be:
if selection=="use": print(inventory) remove=input("What do you want to use? ") inventory.remove(remove) print(inventory) elif selection=="pickup": print(inventory) add=input("What do you want to pickup? ") inventory.append(add) print(inventory) You don't need to build a new inventory list every time you add a new item.
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