Python: Installed Anaconda, but can't import numpy or matplotlib in Jupyter notebook

Question

I'm new to Python, so maybe there is a simple solution to this. I installed Anaconda and thought everything would be straightforward, but even though Jupyter works fine I can't import numpy and matplotlib into my notebook. Instead I get this error:

---------------------------------------------------------------------------
ImportError                               Traceback (most recent call last)
<ipython-input-1-1e0540761e0c> in <module>()
----> 1 import matplotlib.pyplot as plt
      2 vals = [1, 2, 3, 4]
      3 plt.plot(vals)

//anaconda/lib/python3.5/site-packages/matplotlib/__init__.py in <module>()
    120 # cbook must import matplotlib only within function
    121 # definitions, so it is safe to import from it here.
--> 122 from matplotlib.cbook import is_string_like, mplDeprecation, dedent, get_label
    123 from matplotlib.compat import subprocess
    124 from matplotlib.rcsetup import (defaultParams,

//anaconda/lib/python3.5/site-packages/matplotlib/cbook.py in <module>()
     31 from weakref import ref, WeakKeyDictionary
     32 
---> 33 import numpy as np
     34 import numpy.ma as ma
     35 

//anaconda/lib/python3.5/site-packages/numpy/__init__.py in <module>()
    144         return loader(*packages, **options)
    145 
--> 146     from . import add_newdocs
    147     __all__ = ['add_newdocs',
    148                'ModuleDeprecationWarning',

//anaconda/lib/python3.5/site-packages/numpy/add_newdocs.py in <module>()
     11 from __future__ import division, absolute_import, print_function
     12 
---> 13 from numpy.lib import add_newdoc
     14 
     15 ###############################################################################

//anaconda/lib/python3.5/site-packages/numpy/lib/__init__.py in <module>()
      6 from numpy.version import version as __version__
      7 
----> 8 from .type_check import *
      9 from .index_tricks import *
     10 from .function_base import *

//anaconda/lib/python3.5/site-packages/numpy/lib/type_check.py in <module>()
      9            'common_type']
     10 
---> 11 import numpy.core.numeric as _nx
     12 from numpy.core.numeric import asarray, asanyarray, array, isnan, \
     13                 obj2sctype, zeros

//anaconda/lib/python3.5/site-packages/numpy/core/__init__.py in <module>()
     12         os.environ[envkey] = '1'
     13         env_added.append(envkey)
---> 14 from . import multiarray
     15 for envkey in env_added:
     16     del os.environ[envkey]

ImportError: dlopen(//anaconda/lib/python3.5/site-packages/numpy/core/multiarray.so, 10): Symbol not found: _strnlen
  Referenced from: /anaconda/lib/python3.5/site-packages/numpy/core/../../../..//libmkl_intel_lp64.dylib
  Expected in: flat namespace
 in /anaconda/lib/python3.5/site-packages/numpy/core/../../../..//libmkl_intel_lp64.dylib

Since both packages show up in $ conda list its probably some kind of linking error(?), but that is unfortunately something a beginner can hardly solve for himself. Can anyone help?

At a first glance this looks like a serious problem with your installation as the error refers to some .dylib (DYnamic LIBrary) file which has to do with NumPy internals, not with your code. — ForceBru
– ForceBru, Commented Oct 11, 2016 at 16:21
@ForceBru I did nothing else than downloading & installing Anaconda, opening a Jupyter notebook and running a few simple scripts. — mgtheater
– mgtheater, Commented Oct 11, 2016 at 16:23
I see, but this is still a pretty odd error for me as it's complaining about the fact that the _strnlen C standard library symbol is missing, and this symbol is kinda standard, it should be present, but it isn't... — ForceBru
– ForceBru, Commented Oct 11, 2016 at 16:28
I am on a fairly old system (OS X 10.6.8), but I have Python 3.5 and all the packages installed fine and are up to date. — mgtheater
– mgtheater, Commented Oct 11, 2016 at 16:34
@ForceBru It seems that _strnlen is indeed missing in 10.6.8, see here and here. Is there a way to add it manually? It would be really depressing if I couldn't use SciPy due to this. — mgtheater
– mgtheater, Commented Oct 11, 2016 at 16:46

Community · Accepted Answer · 2017-05-23 12:19:30Z

1

The key to your problem is possibly that you're running a pretty old Mac OS X version as _strnlen wasn't even available until 10.7 release.

Anaconda is built for at least OS X 10.7 (according to this), so you're probably out of luck here and a possible solution would be to upgrade the system.

edited May 23, 2017 at 12:19

CommunityBot

11 silver badge

answered Oct 11, 2016 at 16:40

ForceBru

45k10 gold badges72 silver badges104 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Lampros Tzanetos · Accepted Answer · 2016-10-11 16:18:11Z

0

Okay so If I correctly understand what you are saying I propose that you add the package in the same folder your python file is located in. If possible add the code you have used to import the data so I can located any possible mistakes

answered Oct 11, 2016 at 16:18

Lampros Tzanetos

3331 gold badge3 silver badges20 bronze badges

4 Comments

ForceBru Over a year ago

The code is cited at the beginning of the error message.

Lampros Tzanetos Over a year ago

Okay so did you try what I mentioned? The problem is that your problem can't locate the package thus, you get the error Expected in: flat namespace in /anaconda/lib/python3.5/site-packages/numpy/core/../../../..//libmkl_intel_lp64.dylib If what I mentioned initially doesn't work try adding your package in your python 3.5 folder in the folder packages

mgtheater Over a year ago

@LamprosTzanetos I tried to copy the numpy-1.11.2-py35_0 folder to the project dir, but that gives the same error message.

Lampros Tzanetos Over a year ago

I have faced a similar problem in the past. You have to locate the packages folder not the project dir. If you can't find add you program files as well as the package in a new folder and try running the program again.

Collectives™ on Stack Overflow

Python: Installed Anaconda, but can't import numpy or matplotlib in Jupyter notebook

2 Answers 2

Comments

4 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

4 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related