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f17a77af46
In this code def f(a, b=[]): b.append(a) return b all single argument calls to f() will affect the same copy of b. In the controls case, controls=None has the same effect as controls=[]. Signed-off-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz> Reviewed-by: Noel Power <noel.power@suse.com>