#!/usr/local/bin/python2
class C:
  def __init__(self):
    self.l = []
  def __setitem__(self, k, v):
    self.l[k] = v
  def __getitem__(self, k):
    return self.l[k]

c = C()
c.l[:] += (2,3)
c[:] += (1,)
print c.l