Roulette was first played in France back in the 17th century. 36 numbers and one zero. On a single zero a roulette wheel has 38 slots table the House advantage is 2.
On a double zero roulette table it is 5. See Roulette Quiz – The Casino Advantage.
In the second case, if the following spin the outcome is again zero, then the whole bet is lost. The la partage roulette rule is similar to the en prison rule, only in this case the player loses half the bet and does not have the option of leaving the bet en prison for another spin. Even and applies when the outcome is zero.
Both the La Partage and the En Prison roulette rules essentially cut the casino edge on the ‘even-money bets’ in half. So a bet on Red on a single-zero roulette table with the la partage rule or the en prison rule has a 1. House edge and one on a double-zero roulette table has a House edge of 2.