The Carpet python (Morelia spilota) - see related link to Wilipedia for a picture.
Its called snake skin
The snake you're thinking of - is a Carpet python. It's a non-venomous species that grows to about 3 metres.
The outer covering of a snake is scales, it's the same as fish.
This is the snake commonly called the carpet snake or carpet python (Morelia spilota).The carpet snake is quite harmless, but known to eat a variety of native Australian birds and mammals up to the size of a possum. It can grow up to 3.5 metres in length.
Snakes - and other reptiles - are covered with interlocking scales, which are attached to their skin.
Snakes are covered in scales.
Snake sounds are generally known as hisses.