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Installing numpy python3

Mon Mar 05, 2018 6:44 am


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: 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?

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Location: thailand

Re: Installing numpy python3

Mon Mar 05, 2018 11:36 am

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

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Re: Installing numpy python3

Mon Mar 05, 2018 11:58 am

Try installing it with 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.
Electronic and Computer Engineer
Pi Interests: Home Automation, IOT, Python and Tkinter

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Re: Installing numpy python3

Fri Mar 09, 2018 3:04 am

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.

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Re: Installing numpy python3

Thu Sep 27, 2018 9:58 pm

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: ... 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.
Former RPF staff. Author of gpiozero and creator of piwheels.

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Re: Installing numpy python3

Wed Nov 28, 2018 5:57 pm

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

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Re: Installing numpy python3

Thu Mar 28, 2019 10:10 am

I'm wandering if dependancies like libatlas could be listed here (and similarly for other packages).

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

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