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A language built-in type to support ranges. Example of range literal: 
x = range(1, 10, 3)
Accessing elements is possible using indexing (starts from 0): 
e = x[1]   # e == 2
Ranges do not support the + operator for concatenation.Similar to strings, ranges support slice operations: 
range(10)[1:3]   # range(1, 3)
range(10)[::2]  # range(0, 10, 2)
range(10)[3:0:-1]  # range(3, 0, -1)
Ranges are immutable, as in Python 3.