Also, don't forget that python has;

  list = [
    1,2,3,
    [ 4, 5 ],
    6
  ]

Without this Python would basically have to be Yaml-ish Lisp:

  =
    a
    *
      2
      +
        3
        4

Let's drop the leading Yaml dashes needed to make ordered list elements. So we have an = node (assignment) which takes an a destination, and a * expression as the source operand. *'s operands are 2 and a + node, whose operands are 3 and 4.