text: from testutils import assert_raises
  
  a = 1
  del a
  
  class MyObject: pass
  foo = MyObject()
  foo.bar = 2
  assert hasattr(foo, 'bar')
  del foo.bar
  
  assert not hasattr(foo, 'bar')
  
  x = 1
  y = 2
  del (x, y)
  assert_raises(NameError, lambda: x)
  assert_raises(NameError, lambda: y)
  