python3

System: Slackware Linux (version 14.2)
CPUs: Intel(R) Atom(TM) CPU N270 @1.60GHz
Deps: sbopkg-0.38.1-noarch-1_wsr.tgz,
pytz-2018.3.tar.gz

Installation of Python-3.7.2.

Install sbopkg and synchronise with the remote server.

root@darkstar:/tmp# sbopkg -i python3

...

python3:
  Checking GPG for python3.tar.gz ... OK
  Processing python3 3.7.2-1
  Using original .info file
  Using original SlackBuild file
  No build options selected.

...

Do you wish to proceed based on the search results above? Packages not
found will be skipped during the process.

(P)roceed or (Q)uit?: P

...

Done upgrading/installing package.

...

root@darkstar:/tmp#

https://sourceforge.net/projects/docutils/files/docutils/0.14/
docutils-0.14.tar.gz

http://slackbuilds.org/repository/14.2/development/docutils/
docutils.tar.gz

http://slackbuilds.org/repository/14.2/python/python3-certifi/
certifi-2019.3.9.tar.gz
python3-certifi.tar.gz

http://slackbuilds.org/repository/14.2/python/pytz/
pytz-2018.3.tar.gz
pytz.tar.gz

root@darkstar:/tmp# cd docutils
root@darkstar:/tmp/docutils# ./docutils.SlackBuild

...

root@darkstar:/tmp/docutils# cd ../python3-certifi
root@darkstar:/tmp/python3-certifi# ./python3-certifi.SlackBuild

...

root@darkstar:/tmp/python3-certifi# cd ../pytz
root@darkstar:/tmp/pytz# PYTHON3=yes ./pytz.SlackBuild

...

root@darkstar:/tmp/pytz# cd ..
root@darkstar:/tmp# installpkg docutils-0.14-i586-1_SBo.tgz \
> python3-certifi-2019.3.9-i586-1_SBo.tgz pytz-2018.3-i586-1_SBo.tgz

...

root@darkstar:/tmp# exit
logout
bash-4.3$