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Blurhash is an algorithm that lets you transform image data into a small text representation of a blurred version of the image that might be used as a placeholder while the image downloads, for example.
Cog is a nifty code-generator utility done with python scripts hidden in comments in the source files, so the generated code is OK to check in to source-code control. Useful for repetitive compiled-in data, or for filling in gaps in the syntax of the host language.
Retrospective on the history of the PyPy project to date.