The python was found off Drumfrochar Road and was taken to a vet.
Police have since traced the owner and confirmed there is no criminality involved.
Beverley Naismith, of the Abbey Veterinary Group, which looked after the snake, said: "Snakes of this type are generally more suited to temperatures found in Southern and South East Asia.
"They thrive in water and marshland but unfortunately the freezing conditions found on the hills around Greenock are far from ideal.
"As temperatures drop, initially these snakes become less active and move about slowly, they then become torpid and are unable to move or to react to stimuli.