install from requirements file code example

Example 1: install requirements.txt

pip install -r requirements.txt

Example 2: how to get requirements .txt

pip freeze > requirements.txt

Example 3: install requirements.txt in pip command

note: yor should be on the same dir as requirements.txt file 

pip install -r requirements.txt

Example 4: pip3 install requirements.txt

$ pip install -r requirements.txt --no-index --find-links file:///tmp/packages