toggle python 3 by default instead of python 2.7
debian is still delivered with 2.7 as the default version of python. /usr/bin/python is in fact a symlink to the current default versions binary.
The update-alternatives scripts allows to change this.
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root@debdev ~# ls -l /usr/bin/pythonlrwxrwxrwx 1 root root 9 Nov 24 2017 /usr/bin/python -> python2.7 |
Check with versions are already installed
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root@debdev ~# dpkg -l | grep python...ii python2.7 ...ii python3 ...ii python3.5 ...root@debdev ~# ls -l /usr/bin/python*/usr/bin/python -> python2.7/usr/bin/python2 -> python2.7/usr/bin/python2.7/usr/bin/python3 -> python3.5/usr/bin/python3.5 |
In my example Python 2.7 and 3.5 are installed. python3 is a symlink to 3.5
To set python 3.5 as default use the update-alternatives scripts. You can set more alternatives the last number defines the priority. Higher number means higher priority.
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root@debdev ~# update-alternatives --install /usr/bin/python python /usr/bin/python3.5 2root@debdev ~# update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1 |
After setting more then one alternatives you can easily switch the version by
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root@debdev ~# update-alternatives --config python |
This information was taken from this website :
https://michlstechblog.info/blog/debian-set-python-3-as-default/#:~:text=debian%20is%20still%20delivered%20with,scripts%20allows%20to%20change%20this.&text=To%20set%20python%203.5%20as%20default%20use%20the%20update%2Dalternatives%20scripts.
