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python sklearn import failed on libquadmath.so.0 in 3.5.1

Getting import Error while importing sklearn , the only Error code what it says is libquadmath.so.0 which i'm unale to see on the pkg path but same module works fine in 3.6.1.
>>> import sklearn
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/python3/lib/python3.5/site-packages/sklearn/__init__.py", line 57, in <module>
from .base import clone
File "/python3/lib/python3.5/site-packages/sklearn/base.py", line 11, in <module>
from .utils.fixes import signature
File "/python3/lib/python3.5/site-packages/sklearn/utils/__init__.py", line 11, in <module>
from .validation import (as_float_array,
File "/python3/lib/python3.5/site-packages/sklearn/utils/validation.py", line 16, in <module>
from ..utils.fixes import signature
File "/python3/lib/python3.5/site-packages/sklearn/utils/fixes.py", line 324, in <module>
from scipy.sparse.linalg import lsqr as sparse_lsqr
File "/python3/lib/python3.5/site-packages/scipy-0.18.0rc2-py3.5-linux-x86_64.egg/scipy/sparse/linalg/__init__.py", line 112, in <module>
from .isolve import *
File "/python3/lib/python3.5/site-packages/scipy-0.18.0rc2-py3.5-linux-x86_64.egg/scipy/sparse/linalg/isolve/__init__.py", line 6, in <module>
from .iterative import *
File "/python3/lib/python3.5/site-packages/scipy-0.18.0rc2-py3.5-linux-x86_64.egg/scipy/sparse/linalg/isolve/iterative.py", line 7, in <module>
from . import _iterative
ImportError: libquadmath.so.0: cannot open shared object file: No such file or directory

Same error for all imports: module 'collections' has no attribute 'namedtuple'

Python refuses to import any module, including something as basic as numpy, and throws the same error for all of them.
I am working with Python 3.5.2 and Anaconda 4.2.0 (64-bit) with GCC 4.4.7 (Red Hat 4.4.7-1). I recently installed the following modules via pip:
packaging
appdirs
triangle
glumpy
See example feedback below.
>>> import numpy
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/anaconda3/lib/python3.5/site-packages/numpy/__init__.py", line 142, in <module>
from . import add_newdocs
File "/anaconda3/lib/python3.5/site-packages/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "/anaconda3/lib/python3.5/site-packages/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "/anaconda3/lib/python3.5/site-packages/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "/anaconda3/lib/python3.5/site-packages/numpy/core/__init__.py", line 33, in <module>
from . import _internal # for freeze programs
File "/anaconda3/lib/python3.5/site-packages/numpy/core/_internal.py", line 12, in <module>
from numpy.compat import asbytes, basestring
File "/anaconda3/lib/python3.5/site-packages/numpy/compat/__init__.py", line 13, in <module>
from . import _inspect
File "/anaconda3/lib/python3.5/site-packages/numpy/compat/_inspect.py", line 10, in <module>
import types
File "/anaconda3/lib/python3.5/types.py", line 166, in <module>
import functools as _functools
File "/anaconda3/lib/python3.5/functools.py", line 21, in <module>
from collections import namedtuple
File "/anaconda3/pkgs/vispy-0.4.0.106.gf8a69d0-np110py35_0/lib/python3.5/site-packages/vispy/visuals/collections/__init__.py", line 26, in <module>
from . path_collection import PathCollection # noqa
File "/anaconda3/pkgs/vispy-0.4.0.106.gf8a69d0-np110py35_0/lib/python3.5/site-packages/vispy/visuals/collections/path_collection.py", line 6, in <module>
from . raw_path_collection import RawPathCollection
File "/anaconda3/pkgs/vispy-0.4.0.106.gf8a69d0-np110py35_0/lib/python3.5/site-packages/vispy/visuals/collections/raw_path_collection.py", line 7, in <module>
from vispy import glsl
File "/anaconda3/lib/python3.5/site-packages/vispy/__init__.py", line 30, in <module>
from .util import config, set_log_level, keys, sys_info # noqa
File "/anaconda3/lib/python3.5/site-packages/vispy/util/__init__.py", line 9, in <module>
from .logs import logger, set_log_level, use_log_level # noqa
File "/anaconda3/lib/python3.5/site-packages/vispy/util/logs.py", line 6, in <module>
import logging
File "/anaconda3/lib/python3.5/logging/__init__.py", line 26, in <module>
import sys, os, time, io, traceback, warnings, weakref, collections
File "/anaconda3/lib/python3.5/traceback.py", line 5, in <module>
import linecache
File "/anaconda3/lib/python3.5/linecache.py", line 11, in <module>
import tokenize
File "/anaconda3/lib/python3.5/tokenize.py", line 98, in <module>
class TokenInfo(collections.namedtuple('TokenInfo', 'type string start end line')):
AttributeError: module 'collections' has no attribute 'namedtuple'
How do I fix this?

Importing packages on Anaconda on Windows won't work if PYTHONPATH is set

I've installed Anaconda 4.1.12 x64 on Windows and, when running python apps on command line, it imports packages as numpy just fine... unless I set the environment variable PYTHONPATH. I want to run Caffe on windows, and thus I need to put the Caffe binding on its path.
My test case is this small test.py file:
import numpy as np
print np
If I python test.py it on the command line, with PYTHONPATH not set, I get this:
<module 'numpy' from 'C:\Anaconda2\lib\site-packages\numpy\__init__.pyc'>
Seems fine. But if I set PYTHONPATH, the output is this:
Traceback (most recent call last):
File "test.py", line 1, in <module>
import numpy as np
File "C:\Anaconda2\lib\site-packages\numpy\__init__.py", line 142, in <module>
from . import add_newdocs
File "C:\Anaconda2\lib\site-packages\numpy\add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "C:\Anaconda2\lib\site-packages\numpy\lib\__init__.py", line 8, in <module>
from .type_check import *
File "C:\Anaconda2\lib\site-packages\numpy\lib\type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "C:\Anaconda2\lib\site-packages\numpy\core\__init__.py", line 58, in <module>
from numpy.testing.nosetester import _numpy_tester
File "C:\Anaconda2\lib\site-packages\numpy\testing\__init__.py", line 12, in <module>
from . import decorators as dec
File "C:\Anaconda2\lib\site-packages\numpy\testing\decorators.py", line 21, in <module>
from .utils import SkipTest
File "C:\Anaconda2\lib\site-packages\numpy\testing\utils.py", line 15, in <module>
from tempfile import mkdtemp, mkstemp
File "C:\Anaconda2\lib\tempfile.py", line 32, in <module>
import io as _io
File "C:\caffe-windows\python\caffe\io.py", line 2, in <module>
import skimage.io
File "C:\Anaconda2\lib\site-packages\skimage\__init__.py", line 157, in <module>
from .util.dtype import *
File "C:\Anaconda2\lib\site-packages\skimage\util\__init__.py", line 1, in <module>
from .dtype import (img_as_float, img_as_int, img_as_uint, img_as_ubyte,
File "C:\Anaconda2\lib\site-packages\skimage\util\dtype.py", line 8, in <module>
dtype_range = {np.bool_: (False, True),
AttributeError: 'module' object has no attribute 'bool_'
What am I missing?
Edit: adding feedback for #cco:
While trying to import skimage.io:
With PYTHONPATH not set:
<module 'skimage.io' from 'C:\Anaconda2\lib\site-packages\skimage\io\__init__.pyc'>
With PYTHONPATH set:
Traceback (most recent call last):
File "test2.py", line 1, in <module>
import skimage.io as ski
File "C:\Anaconda2\lib\site-packages\skimage\__init__.py", line 157, in <module>
from .util.dtype import *
File "C:\Anaconda2\lib\site-packages\skimage\util\__init__.py", line 1, in <module>
from .dtype import (img_as_float, img_as_int, img_as_uint, img_as_ubyte,
File "C:\Anaconda2\lib\site-packages\skimage\util\dtype.py", line 2, in <module>
import numpy as np
File "C:\Anaconda2\lib\site-packages\numpy\__init__.py", line 142, in <module>
from . import add_newdocs
File "C:\Anaconda2\lib\site-packages\numpy\add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "C:\Anaconda2\lib\site-packages\numpy\lib\__init__.py", line 8, in <module>
from .type_check import *
File "C:\Anaconda2\lib\site-packages\numpy\lib\type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "C:\Anaconda2\lib\site-packages\numpy\core\__init__.py", line 58, in <module>
from numpy.testing.nosetester import _numpy_tester
File "C:\Anaconda2\lib\site-packages\numpy\testing\__init__.py", line 12, in <module>
from . import decorators as dec
File "C:\Anaconda2\lib\site-packages\numpy\testing\decorators.py", line 21, in <module>
from .utils import SkipTest
File "C:\Anaconda2\lib\site-packages\numpy\testing\utils.py", line 15, in <module>
from tempfile import mkdtemp, mkstemp
File "C:\Anaconda2\lib\tempfile.py", line 32, in <module>
import io as _io
File "C:\caffe-windows\python\caffe\io.py", line 2, in <module>
import skimage.io
File "C:\Anaconda2\lib\site-packages\skimage\io\__init__.py", line 11, in <module>
from ._io import *
File "C:\Anaconda2\lib\site-packages\skimage\io\_io.py", line 1, in <module>
from io import BytesIO
ImportError: cannot import name BytesIO

AttributeError: 'module' object has no attribute 'tokenize'

I have nltk installed in my virtualenv. When I do pip freeze , among other packages I can see nltk==3.2.1.
I am using Ubuntu 14.04 and python 2.7. And After activating virtualenv, when I try to import nltk from python shell, I get following error.
>>> import nltk
Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/nltk/__init__.py", line 128, in <module>
from nltk.chunk import * File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/nltk/chunk/__init__.py", line 157, in <module>
from nltk.chunk.api import ChunkParserI File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/nltk/chunk/api.py", line 13, in <module>
from nltk.parse import ParserI File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/nltk/parse/__init__.py", line 79, in <module>
from nltk.parse.transitionparser import TransitionParser File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/nltk/parse/transitionparser.py", line 21, in <module>
from sklearn.datasets import load_svmlight_file File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/sklearn/__init__.py", line 57, in <module>
from .base import clone File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/sklearn/base.py", line 11, in <module>
from .utils.fixes import signature File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/sklearn/utils/__init__.py", line 17, in <module>
from ..externals.joblib import cpu_count File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/sklearn/externals/joblib/__init__.py", line 127, in <module>
from .parallel import Parallel File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/sklearn/externals/joblib/parallel.py", line 30, in <module>
from .format_stack import format_exc, format_outer_frames File "/home/kenden/den/codes/myenv/lib/python2.7/site-packages/sklearn/externals/joblib/format_stack.py", line 35, in <module>
generate_tokens = tokenize.tokenize AttributeError: 'module' object has no attribute 'tokenize'
How can I solve this problem?

Can not execute python script or go to python shell

I can not run my Python script or even run command Python to go to python shell. What's wrong with my Python?
machine:project user$ python
Traceback (most recent call last):
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site.py", line 62, in <module>
import os
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 398, in <module>
import UserDict
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/UserDict.py", line 83, in <module>
import _abcoll
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/_abcoll.py", line 11, in <module>
from abc import ABCMeta, abstractmethod
File "abc.py", line 2, in <module>
import scipy.special
File "/Library/Python/2.7/site-packages/scipy/__init__.py", line 70, in <module>
from numpy import show_config as show_numpy_config
File "/Library/Python/2.7/site-packages/numpy/__init__.py", line 153, in <module>
from . import add_newdocs
File "/Library/Python/2.7/site-packages/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "/Library/Python/2.7/site-packages/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "/Library/Python/2.7/site-packages/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "/Library/Python/2.7/site-packages/numpy/core/__init__.py", line 11, in <module>
from . import numeric
File "/Library/Python/2.7/site-packages/numpy/core/numeric.py", line 5, in <module>
import collections
File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/collections.py", line 6, in <module>
__all__ += _abcoll.__all__
AttributeError: 'module' object has no attribute '__all__'
But anyway everything still looks fine if run Python outside my project directory.

You have a local file called abc.py which is hiding the built-in abc module. Rename your file to something else.