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numpy suddenly stopped working on Raspberry

Week before perfectly working numpy stopped working under Python 3.7 on Raspbian GNU/Linux 10 (buster). Still works with Python 2.7.
~ $ python3
Python 3.7.3 (default, Apr 3 2019, 05:39:12)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import numpy
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/numpy/core/__init__.py", line 24, in <module>
from . import multiarray
File "/usr/local/lib/python3.7/dist-packages/numpy/core/multiarray.py", line 14, in <module>
from . import overrides
File "/usr/local/lib/python3.7/dist-packages/numpy/core/overrides.py", line 7, in <module>
from numpy.core._multiarray_umath import (
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/python3.7/dist-packages/numpy/__init__.py", line 142, in <module>
from . import core
File "/usr/local/lib/python3.7/dist-packages/numpy/core/__init__.py", line 54, in <module>
raise ImportError(msg)
ImportError:
IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
Importing the numpy c-extensions failed.
- Try uninstalling and reinstalling numpy.
- If you have already done that, then:
1. Check that you expected to use Python3.7 from "/usr/bin/python3",
and that you have no directories in your PATH or PYTHONPATH that can
interfere with the Python and numpy version "1.18.1" you're trying to use.
2. If (1) looks fine, you can open a new issue at
https://github.com/numpy/numpy/issues. Please include details on:
- how you installed Python
- how you installed numpy
- your operating system
- whether or not you have multiple versions of Python installed
- if you built from source, your compiler versions and ideally a build log
- If you're working with a numpy git repository, try `git clean -xdf`
(removes all files not under version control) and rebuild numpy.
Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.
Original error was: libf77blas.so.3: cannot open shared object file: No such file or directory
Tried to reinstall:
~ $ sudo pip3 uninstall -y numpy
Uninstalling numpy-1.18.1:
Successfully uninstalled numpy-1.18.1
~ $ sudo pip3 install numpy
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Collecting numpy
Using cached https://www.piwheels.org/simple/numpy/numpy-1.18.1-cp37-cp37m-linux_armv7l.whl
Installing collected packages: numpy
Successfully installed numpy-1.18.1
Did not work.
Tried first reinstalling setuptools using sudo pip3 uninstall -y setuptools, returns:
Not uninstalling setuptools at /usr/lib/python3/dist-packages, outside environment /usr
Can't uninstall 'setuptools'. No files were found to uninstall.
But when I try to install it using sudo pip3 install setuptools, returns:
Looking in indexes: https://pypi.org/simple, https://www.piwheels.org/simple
Requirement already satisfied: setuptools in /usr/lib/python3/dist-packages (40.8.0)
I am confused, do not know what to do.

Python3, can't import numpy

I am unable to import numpy.
Tried to uninstall and reinstall numpy by using pip and pip3.
Checked PATH.
I am using Python3 on Windows 10.
Below is the whole error:
Python 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:57:15) [MSC v.1915 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
import numpy
Traceback (most recent call last):
File "C:\Python37\lib\site-packages\numpy\core__init__.py", line 40, in
from . import multiarray
File "C:\Python37\lib\site-packages\numpy\core\multiarray.py", line 13, in
from . import overrides
File "C:\Python37\lib\site-packages\numpy\core\overrides.py", line 6, in
from numpy.core._multiarray_umath import (
ImportError: DLL load failed: The specified module could not be found.
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "", line 1, in
File "C:\Python37\lib\site-packages\numpy__init__.py", line 142, in
from . import core
File "C:\Python37\lib\site-packages\numpy\core__init__.py", line 71, in
raise ImportError(msg)
ImportError:
IMPORTANT: PLEASE READ THIS FOR ADVICE ON HOW TO SOLVE THIS ISSUE!
Importing the multiarray numpy extension module failed. Most
likely you are trying to import a failed build of numpy.
Here is how to proceed:
- If you're working with a numpy git repository, try git clean -xdf
(removes all files not under version control) and rebuild numpy.
- If you are simply trying to use the numpy version that you have installed:
your installation is broken - please reinstall numpy.
- If you have already reinstalled and that did not fix the problem, then:
1. Check that you are using the Python you expect (you're using C:\Python37\python.exe),
and that you have no directories in your PATH or PYTHONPATH that can
interfere with the Python and numpy versions you're trying to use.
2. If (1) looks fine, you can open a new issue at
https://github.com/numpy/numpy/issues. Please include details on:
- how you installed Python
- how you installed numpy
- your operating system
- whether or not you have multiple versions of Python installed
- if you built from source, your compiler versions and ideally a build log
Note: this error has many possible causes, so please don't comment on
an existing issue about this - open a new one instead.
Original error was: DLL load failed: The specified module could not be found.

If you're looking for a more seamless experience on windows, try using PyCharm or Anaconda which will automatically install numpy/scipy for you, rather than the standard python interpreter.

Tensorflow (CPU only) installation Error | Ubuntu 14.10 | numpy 1.8.2

I'm in the process of installing Tensorflow in my Ubuntu 14.10. I've previously installed numpy, scipy, sklearn and also ipython-notebook. I followed the official documentation at Tensorflow.org (pip installation).The location of my tensorflow installation directory is /usr/local/lib/python2.7/dist-packages. I'm getting following error when I execute import tensorflow as ts in my Ubuntu terminal.
>>> import tensorflow as tf
RuntimeError: module compiled against API version 0xa but this version of numpy is 0x9
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/local/lib/python2.7/dist-packages/tensorflow/__init__.py", line 24, in <module>
from tensorflow.python import *
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/__init__.py", line 60, in <module>
raise ImportError(msg)
ImportError: Traceback (most recent call last):
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/__init__.py", line 49, in <module>
from tensorflow.python import pywrap_tensorflow
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 28, in <module>
_pywrap_tensorflow = swig_import_helper()
File "/usr/local/lib/python2.7/dist-packages/tensorflow/python/pywrap_tensorflow.py", line 24, in swig_import_helper
_mod = imp.load_module('_pywrap_tensorflow', fp, pathname, description)
ImportError: numpy.core.multiarray failed to import
Error importing tensorflow. Unless you are using bazel,
you should not try to import tensorflow from its source directory;
please exit the tensorflow source tree, and relaunch your python interpreter from there.
According to the error, it has to be with numpy. I tried to upgrade numpy using command sudo pip install --upgrade numpy but this doesn't seem to upgrade my existing numpy version and the problem still remains.
Any suggestions in solving this issue ?

As I mentioned in the description, I had previously installed numpy. For TensorFlow to run properly numpy has to be there. There has been two numpy versions in my machine.
When I typed
>> import numpy
>> print numpy.__version__
I got 1.8.something as my numpy version. According to the threads I read, this one is somewhat old and doesn't agree with Tensorflow, so I tried to upgrade the numpy version via
pip install numpy --upgrade
command. Still I got 1.8.* as my numpy version by executing above commands in python console. What I did next was to locate my numpy in python and removed numpy from there. These are the commands I used to locate and remove numpy.
numpy.__path__ #to locate numpy location/path
Then I exit from python console and executed following in Ubuntu terminal to remove numpy.
sudo rm -rf /path_to_numpy/numpy #this removed numpy 1.8.* version
Then I ran a sudo apt-get update command and checked the numpy version again and now python console reflected that I'm referring to the newer version of numpy (1.11.3).
The problem solved.
(I again encountered another issue while installing Tensorflow after successfully solving this issue. In that case I had to upgrade python six package)
Now Tensorflow works well in my Ubuntu 14.10 :)
Thanks for your concern :)

Did you follow the instructions?
please exit the tensorflow source tree, and relaunch your python
interpreter from there.

I ran into the same problem on OS X (10.12). Like you, I got caught in a loop where two versions of python didn't match but reinstalling wasn't fixing the mismatch. Eventually, a more thorough removal and reinstallation worked:
upgrade pip (sudo pip install --upgrade pip)
delete the ~/tensorflow directory and its contents
reinstall virtualenv and activate it as per instructions
create a virtualenv environment (virtualenv --system-site-packages ~/tensorflow)
reinstall tensorflow, using sudo to deal with a permissions issue
(sudo pip install --upgrade tensorflow)

Python - Numpy install and import Issue

I've used pip to install the module numpy (sudo pip install numpy).This works fine.
When importing numpy for use in my own module i get several the following errors.
Traceback (most recent call last):
File "<pyshell#65>", line 1, in <module>
import numpy
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/__init__.py", line 180, in <module>
from . import add_newdocs
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/add_newdocs.py", line 13, in <module>
from numpy.lib import add_newdoc
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/lib/__init__.py", line 8, in <module>
from .type_check import *
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/lib/type_check.py", line 11, in <module>
import numpy.core.numeric as _nx
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/core/__init__.py", line 14, in <module>
from . import multiarray
ImportError: dlopen(/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/core/multiarray.so, 2): Symbol not found: _PyBuffer_Type
Referenced from: /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/core/multiarray.so
Expected in: flat namespace
in /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/numpy/core/multiarray.so
I'm assuming the error has something to do with the multiarray.so file. I've tried turning it off and on (uninstall re install) and adding the where pip initially saves the module to python export path
(export PYTHONPATH="usr/local/lib/python2.7/site-packages")
doesn't seem to work.
Using which python in terminal gives me Python 2.7.6**, however I downloaded python 3.5 off of the site.

Issue resolved.
The reason i was having installation issues with pip, was down to the fact (thanks pv) that i was using the command:
"pip install moduleName"
rather than
"pip3.5 install moduleName"
this caused all sorts of complications, because i'm running python 3.5 and the "pip" command is for 2.7.
Thanks again.

FWIW -- and for people in the future who are googling for this error -- I ran into this issue when installing numpy separately via Homebrew. It caused all my installations of Python (via pyenv) to refer to the /usr/local/lib installation of numpy (which is where Homebrew installs it). Uninstalling it via brew uninstall numpy fixed the error.
(I don't remember why I had a homebrew-installed numpy, but oh well)

I encountered the same problem.
I tried many ways like:
$pip uninstall numpy
But that did not fix the problem.
I assume a major reason is that I have anaconda multi-Python environments (I have created both py27 and py35). As a result the PYTHONPATH includes paths for both py27 and py35.
My default python env is py35. So using
$conda install numpy
will install numpy under the anaconda python3.5 path.
When uninstalling the numpy, we are not sure which numpy path is exporting, maybe it is only for my case.
Hence I refer to #Dan Nhuyen's solution.
I uninstall numpy via:
$brew uninstall numpy.
As a result, the extra ambiguous paths is removed. Finally, it works.

What worked for me was to request pip to build numpy from source, instead of using the pre-compiled wheel binary:
pip install --no-binary numpy -r requirements.txt

why python failed to use or upgrade package installed by pip?

This problem may seem simple to most of you but I'm really confused. I tried to install numpy & pandas using pip. So initially I just did:
sudo pip install pandas.
It installed successfully but when i tried:import pandas there's error as:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/Library/Python/2.7/site-packages/pandas/__init__.py", line 7, in <module>
from . import hashtable, tslib, lib
File "pandas/src/numpy.pxd", line 157, in init pandas.hashtable (pandas/hashtable.c:22984)
ValueError: numpy.dtype has the wrong size, try recompiling
Then I assume it's the numpy version wrong (even pandas said installed a newer numpy) I tried to upgrade the numpy using "pip" but system reminded me don't have to.
As I checked, all my "pip" installed python packages are in /usr/local/lib/python2.7/site-package, in which the numpy version is 1.9.1 and pandas 0.15.1
When I do which python, it shows me the python path/usr/local/bin so I assume it's using the system patron and did installed all the packages accordingly
But when I typed in "python" in console, and tried:
import numpy as np
np.version.version
It showed 1.6.1 instead of 1.9.1
Seems it never gets upgraded or failed to use the numpy installed.
How should I fix this?
Thanks

Uninstall Numpy and then Re-install the newest version of it.
pip uninstall numpy
pip install numpy
I too was facing this problem earlier.