broken d3graph

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-7-a19f65f69d5a> in <module>()
----> 1 G

/usr/local/lib/python3.2/site-packages/IPython/core/displayhook.py in __call__(self, result)
    240             self.update_user_ns(result)
    241             self.log_output(format_dict)
--> 242             self.finish_displayhook()
    243
    244     def flush(self):

/usr/local/lib/python3.2/site-packages/IPython/zmq/displayhook.py in finish_displayhook(self)
     59         sys.stdout.flush()
     60         sys.stderr.flush()
---> 61         self.session.send(self.pub_socket, self.msg, ident=self.topic)
     62         self.msg = None
     63

/usr/local/lib/python3.2/site-packages/IPython/zmq/session.py in send(self, stream, msg_or_type, content, parent, ident, buffers, subheader, track, header)
    558
    559         buffers = [] if buffers is None else buffers
--> 560         to_send = self.serialize(msg, ident)
    561         flag = 0
    562         if buffers:

/usr/local/lib/python3.2/site-packages/IPython/zmq/session.py in serialize(self, msg, ident)
    462             content = self.none
    463         elif isinstance(content, dict):
--> 464             content = self.pack(content)
    465         elif isinstance(content, bytes):
    466             # content is already packed, as in a relayed message

/usr/local/lib/python3.2/site-packages/IPython/zmq/session.py in <lambda>(obj)
     77
     78 # ISO8601-ify datetime objects
---> 79 json_packer = lambda obj: jsonapi.dumps(obj, default=date_default)
     80 json_unpacker = lambda s: extract_dates(jsonapi.loads(s))
     81

/usr/local/lib/python3.2/site-packages/zmq/utils/jsonapi.py in dumps(o, **kwargs)
     70         kwargs['separators'] = (',', ':')
     71
---> 72     return _squash_unicode(jsonmod.dumps(o, **kwargs))
     73
     74 def loads(s, **kwargs):

/usr/local/Cellar/python3/3.2.3/Frameworks/Python.framework/Versions/3.2/lib/python3.2/json/__init__.py in dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, cls, indent, separators, default, **kw)
    231         check_circular=check_circular, allow_nan=allow_nan, indent=indent,
    232         separators=separators, default=default,
--> 233         **kw).encode(obj)
    234
    235

/usr/local/Cellar/python3/3.2.3/Frameworks/Python.framework/Versions/3.2/lib/python3.2/json/encoder.py in encode(self, o)
    186         # exceptions aren't as detailed.  The list call should be roughly
    187         # equivalent to the PySequence_Fast that ''.join() would do.
--> 188         chunks = self.iterencode(o, _one_shot=True)
    189         if not isinstance(chunks, (list, tuple)):
    190             chunks = list(chunks)

/usr/local/Cellar/python3/3.2.3/Frameworks/Python.framework/Versions/3.2/lib/python3.2/json/encoder.py in iterencode(self, o, _one_shot)
    244                 self.key_separator, self.item_separator, self.sort_keys,
    245                 self.skipkeys, _one_shot)
--> 246         return _iterencode(o, 0)
    247
    248 def _make_iterencode(markers, _default, _encoder, _indent, _floatstr,

/usr/local/lib/python3.2/site-packages/IPython/utils/jsonutil.py in date_default(obj)
     89         return obj.strftime(ISO8601)
     90     else:
---> 91         raise TypeError("%r is not JSON serializable"%obj)
     92
     93

TypeError: b'{"directed":false,"links":[{"source":0,"target":9},{"source":0,"target":18},{"source":0,"target":19},{"source":0,"target":4},{"source":0,"target":5},{"source":1,"target":3},{"source":1,"target":11},{"source":1,"target":6},{"source":1,"target":14},{"source":2,"target":17},{"source":2,"target":12},{"source":2,"target":13},{"source":2,"target":15},{"source":3,"target":6},{"source":3,"target":10},{"source":3,"target":11},{"source":3,"target":14},{"source":3,"target":16},{"source":4,"target":8},{"source":4,"target":9},{"source":4,"target":7},{"source":5,"target":18},{"source":5,"target":19},{"source":5,"target":13},{"source":5,"target":15},{"source":6,"target":16},{"source":6,"target":11},{"source":6,"target":14},{"source":7,"target":8},{"source":7,"target":9},{"source":8,"target":9},{"source":9,"target":14},{"source":9,"target":16},{"source":10,"target":16},{"source":10,"target":17},{"source":10,"target":11},{"source":10,"target":12},{"source":11,"target":14},{"source":12,"target":16},{"source":12,"target":17},{"source":13,"target":15},{"source":14,"target":16},{"source":14,"target":17},{"source":15,"target":18},{"source":16,"target":17},{"source":18,"target":19}],"multigraph":false,"graph":[["name","Random Geometric Graph"]],"handler":"d3graph","nodes":[{"pos":[0.33657335950224454,0.7142456581451647],"id":0},{"pos":[0.7442259028906747,0.10636290503841428],"id":1},{"pos":[0.6439614809723037,0.7569760720272561],"id":2},{"pos":[0.7966457875968777,0.24579102927351737],"id":3},{"pos":[0.21158895606665418,0.5006992064258619],"id":4},{"pos":[0.43450101687459175,0.9860336930710977],"id":5},{"pos":[0.6755120956697676,0.2472313217196801],"id":6},{"pos":[0.16679608675269997,0.3349676403675954],"id":7},{"pos":[0.04526151789210997,0.40570547308275673],"id":8},{"pos":[0.3433071151885261,0.41564074831129627],"id":9},{"pos":[0.8681553374962689,0.4984970161394494],"id":10},{"pos":[0.8753126423339177,0.36706552449347396],"id":11},{"pos":[0.7200551610518239,0.6700912223025374],"id":12},{"pos":[0.6973673835121166,0.9764515176966589],"id":13},{"pos":[0.5942525137334815,0.3582058949687341],"id":14},{"pos":[0.5177203580575322,0.9659441942188587],"id":15},{"pos":[0.5791869250010893,0.4449835337623078],"id":16},{"pos":[0.6194406842970386,0.5925306730739618],"id":17},{"pos":[0.23041333963198574,0.982441587185185],"id":18},{"pos":[0.2019450062574235,0.9587534838818086],"id":19}]}' is not JSON serializable