[Tutor] optimize a plot

[lina]

>>> g.nodes()
[u'1', u'2', u'34', u'59', u'57']
>>> for node in g.nodes():
	print node

	

Traceback (most recent call last):
  File "<pyshell#201>", line 2, in <module>
    print node
  File "/usr/lib/python2.6/idlelib/rpc.py", line 597, in __call__
    value = self.sockio.remotecall(self.oid, self.name, args, kwargs)
  File "/usr/lib/python2.6/idlelib/rpc.py", line 210, in remotecall
    seq = self.asynccall(oid, methodname, args, kwargs)
  File "/usr/lib/python2.6/idlelib/rpc.py", line 225, in asynccall
    self.putmessage((seq, request))
  File "/usr/lib/python2.6/idlelib/rpc.py", line 324, in putmessage
    s = pickle.dumps(message)
  File "/usr/lib/python2.6/copy_reg.py", line 70, in _reduce_ex
    raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle PySwigObject objects
>>> for node in g.nodes():
	print type(node)

	
<class 'pygraphviz.agraph.Node'>
<class 'pygraphviz.agraph.Node'>
<class 'pygraphviz.agraph.Node'>
<class 'pygraphviz.agraph.Node'>
<class 'pygraphviz.agraph.Node'>

and this problem is weird, when I run python script.py it did not show warning.

well, on the same version idle, it showed above error message.

Thanks