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pip install from requirements.txt

$ pip install -r requirements.txt

pip3 install requirements.txt

pip3 install -r requirements.txt

install requirements python

# To generate your requrements file do:
pip freeze > requirements.py

# To install the requrements do: 
pip install -r requirements.py

# If you want to make sure pip is using python3, you can do this:
python3 -m pip freeze > requirements.py
python3 -m pip install -r requirements.py

# Or:
pip3 freeze > requirements.py
pip3 install -r requirements.py

how to install requirements.txt

 pip3 install -r requirements.txt

install requirements.txt in pip command

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

pip install -r requirements.txt

Installing packages from requirements.txt file

$ pip install -r requirements.txt

install requirements.txt python

pip install -r requirements.txt
pip install to-requirements.txt

how to install downloaded requirements pip with python

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

pip3 install requirements.txt

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

for installing packages inside requirements.txt

pip install pipreqs