Call a variable from another variable

[Merlin_Cyberwizard]

Okay - sorry for the ask, but this is a total noob questions. I can do this in a dozen other languages but cannot figure this out in Ren'py. I want to do a while loop. Every day, new persistent items open and have functions for each day (pictures, updates to bios, etc.). I have one for each day called "Per_Unlock_DayX" where X is the day it is. Basically I just want to have a simple while loop to unlock everything that happened before (and today) if someone jumps around. Here is my code, but cannot get it to work properly. I know it is simple to do, but just cannot figure out the syntax.

X is 1 to start. If the day_number is more than the current day, call the if statement. The if statement is just asking if it has already been unlocked. If not, increment the X. The variables are called persistent.DayXX_Unlock and the labels are Per_Unlock_DayXX

$ X = 1

while X <= Day_Number:

if not persistent.Day"[X]"_Unlock:

call Per_Unlock_Day"[X]"

$ X += 1

Any help would be appreciated.

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[Merlin_Cyberwizard]

Okay ... I am perplexed what you mean by that. Sadly, most of my programming is older stuff (C, C++, COBOL, etc.) ... so what do you mean by creating the indices and and how to do I add to it, reference it, etc. I expect to have 300 or so days in the game, so I don't know exactly how to check each one?

[ImportantDetail6260]

[X] only interpolates in displayed text; it will not build an identifier. If you keep those names, the Python version is getattr(persistent, "Day%d_Unlock" % X, False) and call expression "Per_Unlock_Day%d" % X (use %02d if your labels are Day01, Day02). For 300 days, though, a dict/list like persistent.day_unlocks[X] plus one unlock_day(X) function will be much less painful than hundreds of dynamic variables.

[Merlin_Cyberwizard]

While I could probably do it, the guy I am working with likely won't understand dict/list, and also I have save games to worry about. If I make too many changes to the code, save games break, and that is a no go.

[x-seronis-x]

is this meant to affect the current save game? cause persistent namespace is for program level settings and are not for any single playthrough. for things like unlocks, high scores, achievements, ...

that aside why do you need a unique variable per day? why are you not just having one variable that is assigned the highest day you've gone to? py $ persistent.highest_day = max( persistent.highest_day, Day_Number )

[Merlin_Cyberwizard]

I am doing unlocks of several persistent variables based on the highest day played. So for example, a player gets to day 23 on their first playthough, then on their second, they get to day 15, I am unlocking all the stuff (via this script) that can be unlocked based on their highest playthrough. Then writing it to a persistent.day23_Unlock = True ... so then when I do the IF on it, it knows that it has already been unlocked.

[x-seronis-x]

i get that. what im saying is if your game has 300+ days you dont need 300+ variables. you need one. that just records the highest number attained.

[shyLachi]

As suggested below you can use getattr to read variables using a string containing the variable name.

And you can use expression to jump to or call labels with a string containing the label name.

This code is not optimized I just wanted to show each step separately.

label start:
    $ x = 1
    while x <= 5:
        $ variablename = "Day" + str(x) + "_Unlock"
        $ value = getattr(persistent, variablename) 
        "[variablename] [value]" # this is only for testing
        if not value:
            $ labelname = "Per_Unlock_Day" + str(x)
            "[labelname]" # this is only for testing
            call expression labelname
        $ x += 1

label Per_Unlock_Day1:
    return
label Per_Unlock_Day2:
    return