sudo apt-get install python3
configure alternatives as in (https://linuxconfig.org/how-to-change-from-default-to-alternative-python-version-on-debian-linux):
ls /usr/bin/python*
python --version
sudo update-alternatives --install /usr/bin/python python /usr/bin/python2.7 1
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.4 2
update-alternatives --list python
sudo update-alternatives --config python
select 2 to set python default to python3
install pip, setuptools and virtualenv:
sudo apt-get install python3-pip
sudo pip3 install --upgrade setuptools
sudo pip3 install --upgrade virtualenv
install flexget as in (https://flexget.com/InstallWizard/Linux):
cd ~
virtualenv flexget
cd ~/flexget/
bin/pip install flexget
install transmissionrpc:
bin/pip install transmissionrpc
install subliminal:
bin/pip install subliminal
bin/subliminal --version
to run flexget without activation of the virtualenv:
~/flexget/bin/flexget -V
from (https://flexget.com/Upgrade)
~/flexget/bin/pip install --upgrade flexget