Perform all operations inside the pywikibot repository directory once cloned.

git clone --recursive https://github.com/wikimedia/pywikibot
cd pywikibot

python3 -m venv ~/.venvs/pywikibot
~/.venvs/pywikibot/bin/python -m pip install -r requirements.txt

First create a family file.

~/.venvs/pywikibot/bin/python pwb.py generate_family_file.py

Enter the URL and name to create a family file for the private site. Select no when asked about interwiki links.

Next a user configuration is needed.

cp user-config.py.sample user-config.py
vi user-config.py

Eg.

mylang = 'en-gb'
family = 'MySite'
usernames['MySite']['en-gb'] = 'Mybot'

Lastly run the login script to enter the password.

~/.venvs/pywikibot/bin/python pwb.py login -v -v

~/.venvs/pywikibot/bin/python pwb.py <script_name>

Documentation

Third party wikis

Github