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Top Forums UNIX for Beginners Questions & Answers How to set python2 as my default? Post 303035085 by Circuits on Tuesday 14th of May 2019 12:48:53 PM
Old 05-14-2019
How to set python2 as my default?

I am trying to figure out how to use update-alternatives to temporally set python2 as my default python interpreter. Currently, using the command:


Code:
sudo update-alternatives --config python

reports:


Code:
There is only one alternative in link group python (providing /usr/bin/python): /usr/bin/python3
Nothing to configure.

However, I do have python2 and python3 installed and working:


Code:
rob@linux044:~$ python
Python 3.6.7 (default, Oct 22 2018, 11:32:17) 
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
rob@linux044:~$ python2
Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15) 
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()

Any idea how I could use update-alternatives to temporary set python2 as the default python interpreter? I was thinking:

Code:
sudo update-alternatives --install /usr/bin/python python3 /usr/bin/python2

or something similar should work but I am not sure and I dont want to attempt it and screw everything up.
 

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DH_PYTHON3(1)							   User Commands						     DH_PYTHON3(1)

NAME
dh_python3 - calculates Python 3 dependencies, adds maintainer scripts to byte compile files, etc. SYNOPSIS
dh_python3 -p PACKAGE [-V [X.Y][-][A.B]] DIR_OR_FILE [-X REGEXPR] OPTIONS
--version show program's version number and exit -h, --help show this help message and exit --no-guessing-deps disable guessing dependencies --no-dbg-cleaning do not remove any files from debug packages --skip-private don't check private directories -v, --verbose turn verbose mode on -i, --indep act on architecture independent packages -a, --arch act on architecture dependent packages -q, --quiet be quiet -p PACKAGE, --package=PACKAGE act on the package named PACKAGE -N NO_PACKAGE, --no-package=NO_PACKAGE do not act on the specified package -V VRANGE specify list of supported Python versions. See py3compile(1) for examples -X REGEXPR, --exclude=REGEXPR exclude items that match given REGEXPR. You may use this option multiple times to build up a list of things to exclude. --compile-all compile all files from given private directory in postinst/rtupdate not just the ones provided by the package (i.e. do not pass the --package parameter to py3compile/py3clean) --depends=DEPENDS translate given requirements into Debian dependencies and add them to ${python:Depends}. Use it for missing items in requires.txt. --recommends=RECOMMENDS translate given requirements into Debian dependencies and add them to ${python:Recommends} --suggests=SUGGESTS translate given requirements into Debian dependencies and add them to ${python:Suggests} SEE ALSO
/usr/share/doc/python3-doc/README.PyDist (python3-doc package) dh_python3 3.0~beta2 September 2010 DH_PYTHON3(1)
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