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Top Forums UNIX for Beginners Questions & Answers How to set python2 as my default? Post 303035090 by Circuits on Tuesday 14th of May 2019 01:40:27 PM
Old 05-14-2019
For anyone in the future who might have stumbled upon this thread:

The easiest way to switch between Python 3 and Python 2:
Code:
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 5

Code:
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2 4

The above will make Python3 the default. Then, to switch to python2:
Code:
 sudo update-alternatives --set python /usr/bin/python2

To switch back to python3:
Code:
sudo update-alternatives --set python /usr/bin/python3

These 3 Users Gave Thanks to Circuits For This Post:
 

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DH_PYSUPPORT(1) 						  python-support						   DH_PYSUPPORT(1)

NAME
dh_pysupport - use the python-support framework to handle Python modules SYNOPSIS
dh_pysupport [debhelper options] [-V X.Y] [-X item [...]] [-n] [module dirs ...] DESCRIPTION
dh_pysupport is a debhelper program that will scan your package, detect public modules in /usr/lib/pythonX.Y/site-packages, and move them to the shared Python modules location. It will generate appropriate postinst/prerm scripts to byte-compile modules installed there for all available python versions. It will also look for private Python modules and will byte-compile them with the current Python version. You may have to list the directories containing private Python modules. If a file named debian/pyversions exists, it is used to determine the python versions with which the package can work. Appropriate dependencies on python-support, python and pythonX.Y are put in ${python:Depends}. The ${python:Versions} and ${python:Provides} optional substitution variables are made available as well. OPTIONS
module dirs If your package installs private python modules in non-standard directories, you can make dh_pysupport check those directories by passing their names on the command line. By default, it will check /usr/lib/$PACKAGE, /usr/share/$PACKAGE, /usr/lib/games/$PACKAGE and /usr/share/games/$PACKAGE -n, --noscripts Do not modify postinst/postrm scripts. -d This option is deprecated. -V X.Y Force private modules to be bytecompiled with the specific X.Y python version, regardless of the default python version on the system. -X item, --exclude=item Exclude files that contain "item" anywhere in their filename from being taken into account to generate the python dependency. It also excludes them from byte-compilation. You may use this option multiple times to build up a list of things to exclude. CONFORMS TO
Python policy as of 2006-08-10 SEE ALSO
debhelper(7) This program is a part of python-support but is made to work with debhelper. AUTHORS
Josselin Mouette <joss@debian.org>, Raphael Hertzog <hertzog@debian.org> 1.0.15 2012-06-30 DH_PYSUPPORT(1)
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