Operations on lists

• The operator + concatenates two lists:

      L1 = [1, 2]
      L2 = [3, 4]
      L = L1 + L2 # [1, 2, 3, 4]

• As you might expect, multiplying a list by an integer concatenates the list with itself several times:

n*L is equivalent to making n additions:

      L = [1, 2]
      3 * L # [1, 2, 1, 2, 1, 2]