#yum -y install python3-pip // system replied: Package python3-pip-9.0.3-22.an8.noarch is already installed.
#pip install docker-compose //system replied: bash: pip: command not found...
#whereis pip //system replied: pip: /usr/bin/pip3.6
#vi /etc/bashrc // add the following line
export PATH=/usr/bin/pip3.6:$PATH
#source /etc/bashr
#