Python keywords cannot be used as fields of edges.  #37

When I try to create a graph of the following single row dataframe (converted to dictionary):

{'count(1)': {19834: 2}, 'destinationAddress': {19834: u'63.240.185.216'}, 'destinationUserName': {19834: u'constructor'}, 'min(startTime)': {19834: u'19 Oct 2015 23:37:32 EDT'}, 'name': {19834: u'An account failed to log on.'}, 'sourceAddress': {19834: None}, 'timeUniform': {19834: 19686.0}}

I receive the following error:

ValueError Traceback (most recent call last)
in ()
1 plotter = graphistry.bind(source='destinationUserName', destination='destinationAddress')
----> 2 plotter.plot(hsldf[19834:19835])

/home/DCSAC/g.paden/.local/lib/python2.7/site-packages/graphistry/plotter.pyc in plot(self, graph, nodes)
303
304 PyG = pygraphistry.PyGraphistry
--> 305 dataset = PyG._etl(dataset)
306 viz_url = PyG._viz_url(dataset['name'], dataset['viztoken'], self._url_params)
307

/home/DCSAC/g.paden/.local/lib/python2.7/site-packages/graphistry/pygraphistry.pyc in _etl(dataset)
160 jres = response.json()
161 if jres['success'] is not True:
--> 162 raise ValueError('Server reported error:', jres['msg'])
163 else:
164 return {'name': jres['dataset'], 'viztoken': jres['viztoken']}

ValueError: ('Server reported error:', u'Illegal value for Message.Field .VectorGraph.edges: .VectorGraph.Edge (Error: Illegal value for Message.Field .VectorGraph.Edge.src of type uint32: function (not an integer))')

I believe it's because the destinationUserName is 'constructor' which I think is interpreted as a function and not a string. The binding are created using

'plotter = graphistry.bind(source='destinationUserName', destination='destinationAddress')'