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Hi,

You should have a look at the documentation of interact. You can access the documentation with

sage: interact?

For your specific example, you can do

var('z')
@interact
def my_interact(a=(1,5,1)):
    f(z) = z^a + z - 1 + 1/z
    complex_plot(f, (-3, 3), (-3, 3)).show()