问Pygraphviz/Python3 3/Mac: TypeError

EN

import networkx as nx
import queueing_tool as qt
import pygraphviz as pgv

a = pgv.AGraph()
print(a._get_prog('fdp'))

g = qt.generate_random_graph(200, seed=3)
q = qt.QueueNetwork(g, seed=3)
q.max_agents = 20000
q.initialize(100)
q.simulate(10000)

pos = nx.nx_agraph.graphviz_layout(g.to_undirected(), prog='neato')

/usr/local/bin/fdp //<-- this shows that Eclipse finds 'fdp' after adding /usr/local/bin to $PATH, ERROR in the following:
Traceback (most recent call last):
  File "/Users/flurin/Documents/workspace/pedQN/main.py", line 14, in <module>
    pos = nx.nx_agraph.graphviz_layout(g.to_undirected(), prog='neato')
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/networkx/drawing/nx_agraph.py", line 228, in graphviz_layout
    return pygraphviz_layout(G,prog=prog,root=root,args=args)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/networkx/drawing/nx_agraph.py", line 262, in pygraphviz_layout
    A.layout(prog=prog,args=args)
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pygraphviz/agraph.py", line 1358, in layout
    data = self._run_prog(prog, ' '.join([args, "-T", fmt]))
  File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/pygraphviz/agraph.py", line 1338, in _run_prog
    warnings.warn(b"".join(errors), RuntimeWarning)
TypeError: cannot use a string pattern on a bytes-like object

/usr/local/bin/fdp
/usr/local/lib/python2.7/site-packages/pygraphviz/agraph.py:1338: RuntimeWarning: Warning: node 0, position [ 5.50797903  7.08147823], expected two floats
Warning: node 12, position [ 5.44649018  7.80314765], expected two floats
[... here other warnings of the same kind]
Warning: Overlap value "prism" unsupported - ignored

  warnings.warn(b"".join(errors), RuntimeWarning)