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Reference | var()

var(name, type, default, min, max)

DescriptionThe variables sheet creates connections between a variable and a user interface control, such as a slider, textfield or check box. The most convenient way of creating variables is through the Python > Variables menu. Variables created like this become part of the global namespace, meaning you can access them just like any other variable.
Tutorial Variables

var("amount", NUMBER, 30, 0, 100)
background(0.1, 0, 0.0)
for i in range(int(amount)):
    image("10.png", 5, 5, alpha=0.25)