Check if my Python has all required packages

Question

I have a requirements.txt file with a list of packages that are required for my virtual environment. Is it possible to find out whether all the packages mention

Answer 1

You can use the -r option from pip freeze that verifies that. It generates a WARNING log for packages that are not installed. One appropriated verbose mode should be selected in order the WARNING message to be shown. For example:

$ pip -vvv freeze -r requirements.txt | grep "not installed"

WARNING: Requirement file [requirements.txt] contains six==1.15.0, but package 'six' is not installed