what is requirements.txt for 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: python requirements.txt

# to generate the requirements.txt file:
pip install pipreqs	# Install via teminal.
pipreqs path/to/project	# Generate requirements.txt file
# There is now a requirements.txt file in the project folder.
# to install a requirements.txt file:
pip install -r requirements.txt
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