Installing numpy python3

[robdog12]

Hi,

I am new to raspberry pie and need to install numpy, pandas, script and Matplotlib for python3. When I install numpy with

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pip3 install numpy

it installs ok. When I try to import numpy within python3 code I get the error

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

Without numpy working none of the other packages which are dependent on numpy work either.

I have been trying to fix this for three days and have reinstalled Rasparian 4 times but I haven't made any real progress.

Does anyone know how to fix this?

[KLL]

did you try (but i not tested)?


From the terminal run:

sudo apt-get install python3-numpy


For for plotting graphs use pylab:

sudo apt-get install python3-matplotlib

[scotty101]

Try installing it with piwheels

https://www.raspberrypi.org/blog/piwheels/

This should be quicker once setup as it will find a version of numpy that is built for the raspberry pi rather than having to build it from source.

[robdog12]

Hi KLL and Scottie101,

I had previously tried the:

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sudo apt-get install python3-numpy 

But previously I made the mistake of not removing the broken version of numpy before attempting to install using apt-get. This meant it didn't install because it registered a version of numpy already installed.
To remove the old version of numpy:

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pip3 uninstall numpy

Once I removed numpy I could install it using KLL's recommended method.

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sudo apt-get install python3-numpy 

Thanks for your help it is all working now.

[ben_nuttall]

It's not very clear but this shows that a shared object file is missing. The numpy you get from piwheels depends on libatlas.

When installing numpy using pip, you also need to install libatlas3-base:

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sudo apt install libatlas3-base
sudo pip3 install numpy

I wrote about this process on the piwheels blog, hope it helps: https://blog.piwheels.org/how-to-work-o ... n-package/

Why choose to pip install from piwheels instead of using apt? It's a much newer version, and new releases are available quickly. The version in Debian/Raspbian is older and will not be updated besides whole distro upgrades like Jessie -> Stretch.

[Chris.KB3CS]

i did not use pip3 to install numpy and the apt repo served up the latest version of numpy.
i had the same missing libf77blas.so error until i did "apt install libatlas3-base" .. then numpy (and matplotlib) started working immediately.

[dannystaple]

I'm wandering if dependancies like libatlas could be listed here https://www.piwheels.org/project/numpy/ (and similarly for other packages).

Happy to contribute metadata somewhere if there's a place to do it...