I also tried python2.7 installed from Homebrew and I get the following: Kimons-MacBook-Pro:graph-tool-2.25 kimonfountoulakis$ python Python 2.7.10 (default, Feb 7 2017, 00:08:15) [GCC 4.2.1 Compatible Apple LLVM 8.0.0 (clang-800.0.34)] on darwin Type "help", "copyright", "credits" or "license" for more information.
import graph_tool
Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/graph_tool/__init__.py", line 104, in <module> import numpy File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/__init__.py", line 142, in <module> from . import add_newdocs File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/add_newdocs.py", line 13, in <module> from numpy.lib import add_newdoc File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/lib/__init__.py", line 8, in <module> from .type_check import * File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/lib/type_check.py", line 11, in <module> import numpy.core.numeric as _nx File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/__init__.py", line 33, in <module> from . import _internal # for freeze programs File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/numpy/core/_internal.py", line 14, in <module> import ctypes File "/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/ctypes/__init__.py", line 7, in <module> from _ctypes import Union, Structure, Array ImportError: dlopen(/usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_ctypes.so, 2): Symbol not found: __PySlice_AdjustIndices Referenced from: /usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_ctypes.so Expected in: flat namespace in /usr/local/opt/python/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_ctypes.so
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