raspbian python3 import numpy and pandas issue

numpy (and pandas) will not import

Reproducing code example:

My code works fine everywhere else, e.g. home PC, AWS instance. Moved it onto my Raspberry Pi 1 B and the code fails. It also fails the same way in ipython3, as shown below.

pi@raspberrypi:~/python/stocks $ ipython3 Python 3.7.3 (default, Dec 20 2019, 18:57:59) Type “copyright”, “credits” or “license” for more information.

IPython 5.8.0 – An enhanced Interactive Python. ? -> Introduction and overview of IPython’s features. %quickref -> Quick reference. help -> Python’s own help system. object? -> Details about ‘object’, use ‘object??’ for extra details.

In [1]: import numpy as np

ImportError Traceback (most recent call last) /usr/local/lib/python3.7/dist-packages/numpy/core/init.py in <module>() 23 try: —> 24 from . import multiarray 25 except ImportError as exc:

/usr/local/lib/python3.7/dist-packages/numpy/core/multiarray.py in <module>() 13 —> 14 from . import overrides 15 from . import _multiarray_umath

/usr/local/lib/python3.7/dist-packages/numpy/core/overrides.py in <module>() 6 ----> 7 from numpy.core._multiarray_umath import ( 8 add_docstring, implement_array_function, _get_implementing_args)

ImportError: libf77blas.so.3: cannot open shared object file: No such file or directory

During handling of the above exception, another exception occurred:

ImportError Traceback (most recent call last) <ipython-input-1-0aa0b027fcb6> in <module>() ----> 1 import numpy as np

/usr/local/lib/python3.7/dist-packages/numpy/init.py in <module>() 140 from . import _distributor_init 141 –> 142 from . import core 143 from .core import * 144 from . import compat

/usr/local/lib/python3.7/dist-packages/numpy/core/init.py in <module>() 52 “”" % (sys.version_info[0], sys.version_info[1], sys.executable, 53 version, exc) —> 54 raise ImportError(msg) 55 finally: 56 for envkey in env_added:

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 “1.18.2” 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

I uninstalled pandas and python3-numpy and reinstalled. It made no difference. I checked in the /usr/bin/python3 which showed this:-

pi@raspberrypi:~/python/stocks $ ls -all /usr/bin/python3 lrwxrwxrwx 1 root root 9 Mar 26 2019 /usr/bin/python3 -> python3.7

Any help would be greatly appreciate. Thanks, Markus

[mattip]

Probably a dulicate of gh-11110 which suggests either

sudo apt-get install libatlas-base-dev

or

pip3 uninstall numpy #remove previously installed package
apt install python3-numpy

[markusmartius]

Sorry for the delayed reply. Due to Covid19 and working from home, I had stopped working on this problem.
I did try mattip’s solution and it worked as well, thank you for that.