[Solved] List not saving until after next line of text

[Kinjo]

This one is hard to explain, and hard to think of a solution, so here I am.

I've got an inventory system that makes use of a list of Items (a class). The button to access this inventory is available on every screen. From within the inventory screen, one can click on the Craft button to select certain items and -- you guessed it -- craft them into a more powerful item. Doing so removes those items from the list and adds the new item.

Now here's the problem. Suppose my inventory list is [A, B, C] and I combine A, B, and C to make D. Then my list becomes [D]. That's fine so far.

However, let's also say I save the game right after doing this. So Save1 should, when loaded, contain [D] in the inventory list.

I decide to advance the text by one, by closing out the inventory screen and clicking the mouse as usual to advance text. Now I save into Save2. The list here should also be [D].

Now I close out of the game, start it up, and decide to load Save1. Instead of seeing [D], I open the inventory to find [A, B, C] as though I never crafted them.

However, if I load Save2, I see [D] just as I expected. So it appears that my changes only remain intact if I save on a line after the one where I crafted something.

Why exactly is this the case, and how can I get around this?

[PyTom]

That's correct, Ren'Py saves at the start of a statement. You can try using renpy.retain_after_load to work around this, but it's semantically weird, so if it causes any problems they're on you.

[Kinjo]

Thank you, that worked perfectly!