discussion I have a Ren'Py modding question

[Burgouis]

I'm modding a game that has customizable ages, and I'm trying to mod it to subtract one custom age from another, to create a third age. (In order to show how old the MC's mom was, when his oldest daughter was born, and she became a grandma.) So, if you could write out the code needed, or show me an example of a game that does this, I'd appreciate it.

So far I have:
define persistent.tsage2 = ([persistent.tsage] - [persistent.dLeahAGE])

Which is throwing up this error:
File "game/script.rpy", line 173, in script
define persistent.tsage2 = ([persistent.tsage] - [persistent.dLeahAGE])
File "game/script.rpy", line 173, in <module>
define persistent.tsage2 = ([persistent.tsage] - [persistent.dLeahAGE])
TypeError: unsupported operand type(s) for -: 'RevertableList' and 'RevertableList'

 

[GrimDrakness]

It's a bit tough to write out the exact code you need without knowing the game, but here is a couple of pointers:

[persistent.tsage] - [persistent.dLeahAGE] means subtracting one list from another - probably not what you want.

define persistent.tsage2 = persistent.tsage - persistent.dLeahAGE

is more likely what you're after.

Note that define is used to define a new variable and set its original value. This happens when the game first launches. So for the above code to work as expected both persistent.tsage and persistent.dLeahAGE must already be defined and have their correct value set.

Hope that helps!

 

[User_65561]

The way I do it is:

Numbers are whatever you want them to be:

default persistent.tsage = 40
default persistent.dLeahAGE = 18
default persistent.tsage2 = 22

label custom_tsage:
    $ persistent.tsage2 = persistent.tsage - persistent.dLeahAGE
return

script:

call custom_tsage
mc "I was [persistent.tsage2] when I had her."

 

[exlurker]

Depending on where you need it, it may be [persistent.tsage - persistent.dLeahAGE]