Do integrable mappings have the Painlevé property?

We present an integrability criterion for discrete-time systems that is the equivalent of the Painlevé property for systems of a continuous variable. It is based on the observation that for integrable mappings the singularities that may appear are confined, i.e., they do not propagate indefinitely when one iterates the mapping. Using this novel criterion we show that there exists a family of nonautonomous integrable mappings which includes the discrete Painlevé equations by P_I, recently derived in a model of two-dimensional quantum gravity, and P_II, obtained as a similarity reduction of the integrable modified Korteweg–de Vries lattice. These systems possess Lax pairs, a well-known integrability feature.