Thank you Tamas. But still I can't go forward by both of python2.7 nor 
python3.5.1...
when I run it by python2.7, I got:
---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-2-9e06b667a294> in <module>()
----> 1 import igraph
      2 from igraph import plot
      3 
      4 g = 
igraph.Graph.Read("/home/sizheng/hdg/sizheng/myfitness/1/3_1_5000.edges",format="edgelist")
      5 

/usr/lib64/python2.7/site-packages/igraph/__init__.py in <module>()
     32 # pylint: disable-msg=W0401
     33 # W0401: wildcard import
---> 34 from igraph._igraph import *
     35 from igraph._igraph import __version__, __build_date__
     36 from igraph.clustering import *

ImportError: /usr/lib64/python2.7/site-packages/igraph/_igraph.so: undefined 
symbol: _ZTVN10__cxxabiv121__vmi_class_type_infoE
when I run it by python3.5.1, I got:
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-40f2a8de40be> in <module>()
      1 dd = g.degree_distribution()
----> 2 plot(dd).show()

/usr/local/lib/python3.5/site-packages/igraph/drawing/__init__.py in plot(obj, 
target, bbox, *args, **kwds)
    444         bbox = BoundingBox(bbox)
    445 
--> 446     result = Plot(target, bbox, background=kwds.get("background", 
"white"))
    447 
    448     if "margin" in kwds:

/usr/local/lib/python3.5/site-packages/igraph/drawing/__init__.py in 
__init__(self, target, bbox, palette, background)
    115         """
    116         self._filename = None
--> 117         self._surface_was_created = not isinstance(target, 
cairo.Surface)
    118         self._need_tmpfile = False
    119 

/usr/local/lib/python3.5/site-packages/igraph/drawing/utils.py in 
__getattr__(self, _)
    394 
    395     def __getattr__(self, _):
--> 396         raise TypeError("plotting not available")
    397     def __call__(self, _):
    398         raise TypeError("plotting not available")

TypeError: plotting not available

sizheng
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