Commands to update all Python packages on Windows or Linux systems.

updateall.py

pip list --outdated
pip freeze | %{$_.split('==')[0]} | %{pip install --upgrade $_}
pip3 list --outdated --format=freeze | grep -v '^\-e' | cut -d = -f 1 | xargs -n1 pip3 install -U
pip3 list -o | cut -f1 -d' ' | tr " " "\n" | awk '{if(NR>=3)print)' | cut -d' ' -f1 | xargs -n1 pip3 install -U
pip freeze > requirements.txt
pip install -r requirements.txt --upgrade
pipenv shell
pipenv update