Twine API Tokens vs Password Auth: Choosing the Right PyPI Upload Credential for Automated Pipelines

Choosing an Authentication Strategy for Automated PyPI Uploads

When configuring Twine to publish Python packages from an automated pipeline, the choice between traditional username/password credentials and scoped API tokens presents a trade-off between setup simplicity and long-term credential hygiene. Both methods authenticate against the same PyPI upload endpoint, so package validation and indexing behavior are identical regardless of which credential type is used.

The constraint is that the pipeline runs on shared infrastructure where secrets must be managed carefully. Password-based authentication requires transmitting the account password on every upload, which may be convenient for ad-hoc local use but raises concerns when embedded in CI variables. API tokens, treated by Twine as a password with the special username __token__, can be scoped and revoked independently of the account password, but they still require secure secret storage to prevent unauthorized uploads if leaked.

Given that both paths produce the same server-side upload event and indexing result, the practical uncertainty is which credential model better fits a team that needs to rotate access regularly and limit blast radius without adding excessive operational overhead.

Should a shared CI pipeline prefer API tokens for revocability and scope control, or is password authentication sufficient when combined with strict environment variable hygiene? How does the choice affect credential rotation workflows when multiple contributors need upload access?