What is double curly braces inside dict used for in python?

Question

I have a python dict, which is a config to a job which looks like this:

#Values
varX = "x"
varY = "y"

conf={
        "spark.someVal": '{{ someComplexMethod("test") }}'
    }

Problem is that when I want to replace/modify the returned value from the method with some globally declared values, it does not reflect since it is probably not in scope.

for eg, This works:

conf={
        "spark.someVal": '{{ someComplexMethod("test").replace("x","y") }}'
    }

But below lines don't.

conf={
        "spark.someVal": '{{ someComplexMethod("test").replace(varX, varY) }}'
    }

OR

conf={
        "spark.someVal": '{{ someComplexMethod("test") }}'.replace(varX, varY)
    }

I don't want to use values directly, any way around this? And can someone please explain what is the use of curly braces here.

Answer 1

Maybe you can setup varX and varY as Airflow Variables.

Then you can use them in your Jinja templates like so:

'{{ someComplexMethod("test").replace(var.value.varX, var.value.varY) }}'