Who uses this?
Search the code inside PyPI packages. Enter a module, function or class and see every indexed package whose latest release uses it, ranked by downloads.
Stats for nerds 🤓
Before a breaking change
Maintainers: see who calls requests.packages or your own API before you remove it.
Before a deprecation
Core developers and PEP authors: count packages that still import distutils or cgi.
Pattern hunting
Security research: find packages that call pickle.loads, eval or marshal.loads.
Ready for the next Python?
See which packages still use modules removed in Python 3.12, 3.13 and 3.14.
Get the code and the data
Pull the Python files out of any package, and find the PyPI datasets that are still available.