Everything about Global Variables [CLOSED]

[YeOlde_Monk]

Hey fellas.
I know that maybe I am littering the forum, but I really tried my best to look through forum with my problem.

So, the question of the day is: how can I define a variable that whole game can see it? 'Cause what I was doing is this:

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$ var = 0

But the thing is I wrote it in the script.rpy, but the other part of game/code is in another tab/page/list or whatever this ".rpy"-thing called.
So I thought about global variables (sounds logical to me). BUT!
Googlin' through Internet I didn't actually found tutorials for them, just tiny bits of everything. So from what I saw, I entered this:

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$ global var
$ var = 0

To my surprise, he ate it. But there still was same error, when it came to 'point-adding moment'.
Of course, I'd found some python code, but it's pretty hard for me (at least it looks like it).
I've tried as well copying part of the code from some game with money (it definitely must be a global variable, isn't it?) Failed that as well... Must be losing some part at the start...

So is there any simpler way to define and use global variable in Ren'Py, or the only way to do that is to learn Python?

[philat]

You misunderstand what global variables are. Global variables are a python concept, not renpy per se, and distinguish variables used globally from ones used within a function.

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def foo(bar):
    bar += 1
    return bar

print foo(1)

For example, bar in the above is a local variable. Trying to access bar outside of the function (e.g., a print bar command) will throw an error, as bar does not exist outside of the function.

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def foo():
    global bar
    bar += 1
    return bar

bar = 1
print foo()

Here, bar is a global variable. By designating bar as a global variable, foo() knows to access a bar that is in a different scope. If you didn't have the global bar line, the function would throw an error that bar is not defined.

In any case, this is just to help you understand what global variables are and is mostly not relevant to renpy scripting. Renpy reads all .rpy files as if they constitute one large file. All .rpy files have access to variables declared in other files. The only thing you have to do is make sure that variables are initialized properly before they are used. The way to do this is to declare them either in init blocks or right after label start. I myself prefer to do them in init blocks, but if you have complex classes or other instances where rollback and save may be compromised, declaring things after the start label is safest.

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init python:
    var = "default value"

label start:
    $ var = "default value"

[YeOlde_Monk]

Well...))) Who would've thought it was so simple?) Now it's working! Thank you very much! Guess now I have everything to complete my game)