how to install requirements file in python code example

Example 1: python requirements.txt

pip freeze #view requirements to be created (best done in virtual env)
pip freeze > requirements.txt #create requirements.txt (best done in virtual env)
pip install -r requirements.txt #install requirements.txt (best done in virtual env)

Example 2: how to install requirements file in python

pip install -r requirements.txt

Example 3: how to install requirements.txt

pip3 install -r requirements.txt