How to create new variable in Yocto to use it in a recipe ?

Bel Hadj Salem Talel <bhstalel@...>

Hi All,

I'm not trying to export or create a variable inside a recipe because that's easy and not my case.
But I want to create a variable that a user can define in local.conf or in other conf files and a recipe that checks the value of that variable and do some stuff with it like:
python (){
 a = d.getVar('MY_VARIABLE' or '')
How can I do this?
Thanks, Talel

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