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Sid, you are not informed properly. To pass from Italy to France, from France to Switzerland, or to Germany, or to Greece, or elsewhere in Europe, from one e.u. state to another included, you almost always will be required to show a passport!
Furthermore, in most, if not all e.u. countries, identity cards are compulsory. If you do not have one with you when you go out (even for a walk), be it an id card, passport or driving licence, you are liable to be arrested and taken to the police station! Sid, please inform yourself better mate!