join string and number variables (or convert variable types)

[Kia]

I never taught this will become a problem for me but I have difficulty put to type of variables together and I can't find how to convert "int" to "string".
this line of code:

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text "Day:" + "[curday]" size 10 anchor(0.5, -0.5)

works fine for some reason but when I try to do it in:

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imagebutton anchor(0.5, 0.5) idle "ui/clock/timer1.png" hover "ui/clock/timer1.png" focus_mask True action SetVariable('daycalc', "Day:" + curday)

it suddenly remembers that the variables have different type.
the "string()" function wont work either. apparently its not included in syntax or something.

[nintendotoad]

https://docs.python.org/2/library/functions.html#str

Does str() work? It does on my end.

[Kia]

the error is gone but it's not doing anything here is the screen that contains this problem

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screen g_time:
    window id "wndw" xysize(0, 0) pos(900, 100):
        imagebutton anchor(0.5, 0.5) idle "ui/clock/timer1.png" hover "ui/clock/timer1.png" focus_mask True action SetVariable('daycalc', "Day:" + str(curday))
        #add "ui/clock/timer1.png" anchor(0.5, 0.5)
        add "ui/clock/timer.png"  at rotateshort
        text "[timcalc]" size 15 anchor(0.5, 0.5)
        text "[daycalc]" size 10 anchor(0.5, -0.5)
show screen g_time

[nintendotoad]

I have no idea what "it's not doing anything" means. As far as I know, it could mean any of the following:
* the variable 'daycalc' doesn't get changed at all
* the variable 'daycalc' is changed, but is only changed to "Day:" because str() itself isn't working
* the variable 'daycalc' is changed, but the player doesn't know that because the screen doesn't show the new value of 'daycalc'
* the screen doesn't even appear anymore

In any case, the below code seems to function as intended; upon clicking on the textbutton, the text immediately changes from 'sandwich' to 'Day:15'. In other words, on Ren'Py 6.17.7.521, I can't replicate your issue. Are there any other functions (especially callbacks) that are changing 'daycalc' or 'curday'?

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screen why_now:
    textbutton "wait" action SetVariable('daycalc', "Day:" + str(curday))
    text "[daycalc]"

label start:
    $ daycalc = "sandwich"
    $ curday = 15
    show screen why_now
    "wait here"