wtf is py-ulid?

py-ulid is a lightweight Python library that generates unique identifiers, the kind of thing databases and distributed systems use to track records. The key advantage over traditional UUIDs is that these identifiers are sortable by time. If you generate a ULID at 2 PM and another at 3 PM, you can sort them alphabetically and they'll come out in the order they were created. That's not something standard UUIDs give you. Under the hood, each ULID is a 26-character string split into two parts: a timestamp (captured to the millisecond) and a chunk of randomness. The timestamp is what makes them sortable, the random part ensures uniqueness even when thousands of IDs are generated in the same millisecond. The library also offers a "monotonic" mode, which guarantees that IDs generated during the same millisecond are still ordered correctly by incrementing the random portion by one each time. You can optionally pass in a specific timestamp, which is handy if you're migrating existing data and need IDs that match when records were originally created. This library would appeal to developers building applications where the order of records matters, think event logs, activity feeds, or any system where you'd want to sort entries chronologically without a separate timestamp column. Because the IDs are shorter than UUIDs (26 characters vs. 36) and contain no special characters, they're also cleaner to use in URLs. A startup building a SaaS product that processes high volumes of events, payment transactions, user actions, audit logs, could benefit from IDs that are both unique and naturally time-ordered. The project is notable for being completely self-contained: it has zero dependencies beyond Python 3.5 or later, so there's nothing else to install or worry about breaking. That said, the README is sparse on details like performance benchmarks or thread safety, so if those matter for your use case you'd want to test before relying on it in production.