maelstrom | Economic MMO-RTS videogame framework in Node.js | Runtime Evironment library

This is a sample of one line of the OP's XML file
109555912.69

The OP wants to use the IMPORTXML function to report the ID and Name as well as the Job Cost from the XML data. Presently, the OP's formula is:
=importxml("link","//job-base-cost")

There are two options:
1 - One long column
=importxml("link","//@id | //@name | //job-base-cost")

Note //@id and //@name in the xpath query: // indicate nodes in the document (at any level, not just the root level) and @ indicate attributes. The pipe | operator indicates AND. So the plain english query is to display the id, name and job-base-cost.

2 - Three columns (table format)
={IMPORTXML("link","//@name"),IMPORTXML("link","//job-base-cost"),IMPORTXML("link","//@id")}

This creates a series that will display the fields in each of three columns.

Note: there is an arrayformula that uses a single importXML function described in How do I return multiple columns of data using ImportXML in Google Spreadsheets?. Readers may want to look at whether that option can be implemented.

My thanks to @Tanaike for his comment which spurred me to look at how xpath works.

There are a couple of potential answers.

I know you don't want to hear it - but in this case another class is really going to be your best friend, because you have a List which can be simply changed from type String to type Spell (which will take your description). But bear in mind, that only requires one Class, not a Class per element, so it's not much work!

Example:

If I got your code right, then you defined an array where you shouldn't have. I fixed the last line of code you posted :

Your problem is that you never call the the PlayerMoving class (for your test at the bottom), just the Player class. Also in the PlayerMoving class you override the Player class' __init__ method. To make sure the Player.__init__ is still called, do something like this:

At the time the line place = test.place is executed, the place attribute on your Player instance has not been defined.

The first time the place attribute gets set is in the move() method. i.e. Attempting to access place before calling move() will result in the error you are observing.

You should assign a default value to self.place in the initializer for the Player class.

I wouldn't have believed it, then I created a MCVE with sqlite, and it didn't raise an error. But it created an invalid database, as you can see here

Obviously "Attack Speed" is not a category_ID and "guberland" is not an user_ID. You need either provide the ID to an existing object, or, much nicer for CRUD applications, a database object for the relationship: