Drilling down in a dict with "complex" objects

[Six]

I am trying to access an objects sub-object attributes. I can boil the
code I am working with down to this problem section:
(snip)
class Pt:
  x = None
  y = None
  def __init__(self, x, y):
    self.x, self.y = x, y
  pass

class Pts:
  curr_point = None
  next_point = None
  def __init__(self, n, m):
    self.next_point = Pt(n, m)
  def update(self, point):
    self.curr_point = self.next_point
    self.next_point = point

class PtManage:
  points = {}
  def __init__(self):
    pass

point = Pts(3,5)
pman = PtManage()
pman.points["odds"] = point
print dir(pman)

print pman["odds"].next_point.x

(snip)

It's this last line that doesn't work. What am I doing wrong? Is this
a failure of the design or am I missing something obvious? How do I
get down and see that "Pt" classes x attribute within the PtManage
dict?