Install pip
On CentOS
wget https://bootstrap.pypa.io/get-pip.py python get-pip.py
On Ubuntu
apt install python-pip
On Ubuntu, python3
apt install python3-pip
Install a python module from github using pip
cd /opt/bench git clone https://github.com/frappe/bench bench-repo
Now run
pip install -e bench-repo
Install modules from requirments.txt
pip install -r requirements.txt
To create requirements.txt file, run
pip freeze > requirements.txt