pip install pip-validate
pip-validate --file pip_validate.py --req requirements.txt
You can either use --file to check a single file or --dir to check a module.
Python files are parsed for import and import from statements. (other ways to import modules, e.g. using __import__() are not considered).
Found external imports and entries in your requirements.txt file will be matched. If PyPI name and module name differ, e.g. delegator.py and delegator, pip-search is used to resolve aliases.
Namespace modules are currently not resolved.