Numpy import error Python3 on Raspberry Pi?

Question

When I try to import numpy in Python3 i get an error.
I installed it via pip3 and it got installed succesfully.

sudo pip3 install numpy

Here is the error message when i try to import numpy:

Python 3.5.3 (default, Sep 27 2018, 17:25:39)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/numpy/core/__init__.py", line 16, in <module>
    from . import multiarray
ImportError: libf77blas.so.3: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.5/dist-packages/numpy/__init__.py", line 142, in <module>
    from . import add_newdocs
  File "/usr/local/lib/python3.5/dist-packages/numpy/add_newdocs.py", line 13, in <module>
    from numpy.lib import add_newdoc
  File "/usr/local/lib/python3.5/dist-packages/numpy/lib/__init__.py", line 8, in <module>
    from .type_check import *
  File "/usr/local/lib/python3.5/dist-packages/numpy/lib/type_check.py", line 11, in <module>
    import numpy.core.numeric as _nx
  File "/usr/local/lib/python3.5/dist-packages/numpy/core/__init__.py", line 26, in <module>
    raise ImportError(msg)
ImportError:
Importing the multiarray numpy extension module failed.  Most
likely you are trying to import a failed build of numpy.
If you're working with a numpy git repo, try `git clean -xdf` (removes all
files not under version control).  Otherwise reinstall numpy.

Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory

Asked By: AVX-42

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Source

Answer 1

Moving my comment to an answer because it seemed helpful to a few users.

You are missing a core numpy dependency. Running

sudo apt-get install python-dev libatlas-base-dev

should fix the problem.

If that doesn’t work, you can try installing RPi specific versions of numpy, see comments here.

Answered By: Bill DeRose

Answer 2

I am going to add an answer as I don’t have enough reputation to comment.

I had this issue on my Raspberry Pi 4.

In my case this was fixed simply by running this in the command line:

sudo apt-get install libatlas-base-dev

I thought initially I was missing a python module dependency, but this is a unix dependency, its shouldn’t affect you python virtual environment

Answered By: Luke_V

Answer 3

Installing libatlas-base-dev did not work for me.

Installing numpy==1.15.1 did.

Answered By: Rick

Numpy import error Python3 on Raspberry Pi?

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