The summary field of a Python package distributed via PyPI is the first thing people searching for packages encounter. Based on the statistics collected by PyDigger 3.76% of the Python packages uploaded to PyPI are missing that field. The full list of those packages can be found here.
Adding this information to the packages can be a nice contribution to both the specific Python package and to the whole Python ecosystem. You will need to understand what the package does and express it in very few words.
Technically in order to make that change easy you'll need to find the repository of the packages. According to the statistics 1.24% of the packages have a VCS linked from the package. Those will be probably the easiest to fix. Here is the full list of Python packages with VCS but without a summary.
There is also some technical details about the summary field that can help you.
If you do it now, still in October you might want to first sign up to the Hacktoberfest to have your contribution count there too.