ImportError: No module named yaml

https://stackoverflow.com/questions/50868322/importerror-no-module-named-yaml/50868994

Solution 1: install python 3.6 and ln python3 to it

export $PYPATH=`which python3`
wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz
tar -Jxf Python-3.6.5.tar.xz
cd Python-3.6.5/
./configure && make && make altinstall
rm $PYPATH
ln -s `which python3.6` $PYPATH
python3 -m pip install pyyaml
python3 env/common_config/add_imagepullsecret.py

Solution 2: use virtualenv

pip3 install virtualenv
virtualenv --python=python3 venv
source venv/bin/activate
pip install pyyaml
python env/common_config/add_imagepullsecret.py

Solution 3: use pipenv

https://pipenv.kennethreitz.org/