It’s not very convenient to install python spidev library under angstrom-linux. You can try two ways:
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Build your customize disto image using openembedded from Toradex with python-spidev(python3-spidev) added. Since it’s very time consuming, if you are making little demo, it’s not very recommonded.
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Use torizon and install python-spidev(python3-spidev) package in debian container. It’s not that difficult and time consuming. You can follow the two articles to do this, link text and link text
I recommond the second option.