Speaking just of long straight wires, not loops, coils or solenoids. Ideal wires have no resistance. Of course they would have no capacitance. And real wires have some very small amount of inductance, no? Firstly, would an ideal wire have some ideal nonzero inductance? Why/why not? After all, an ideal wire should still setup a circling magnetic field which takes energy, no? Wouldn't that magnetic field around an ideal wire still collapse upon switching the current off to keep a tiny more current going for a little bit longer? Secondly, does a real wire, the simplest you could construct, have some tiny degree of capacitance?