18 Jan 2019
This one-liner iterates through your requirements.txt and for every packages fetches and prints the latest version available in PyPi.
cat requirements.txt | grep -v '^\-e' | cut -d= -f1 | xargs -I {} -n1 -P1 sh -c "echo \`curl -s https://pypi.org/project/{}/ | sed -e 's/^[[:space:]]*//' | grep '{} [0-9]' | sed -e 's/ /==/g'\`"
You can use it to keep your requirements.txt updated.
Use with caution! Complex dependencies can break your code.
Always try it in a fresh virtual environment first.