creating a requirements.txt for python

requriments_gen.sh

# the package you need is pipreqs
pip install pipreqs 

# they have a number of arguments. the most useful i found
# is the argument allowing you to check your package on pypi server. 
# this fixed bugs in the requriements.txt packages. e.g skimage is not a package, but pipreqs was listing it down
# another is the version number listed by the pipreqs might be messed up. 
python -m  pipreqs.pipreqs . --force --mode gt --pypi-server https://pypi.org/