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> We spent much more time than we expected on compatibility We similarly had to spend more time on memory usage due to it being a bigger concern than expected

> We spent much more time than we expected on compatibility We similarly had to spend more time on memory usage due to it being a bigger concern than expected What did they expect anyway for starting from scratch instead of improving on existing solid implementations.

mhneu 10y ago
When they say compatibility they largely mean C API compatibility. PyPy doesn't even try for this, and yet it's key for any real world adoption. Building on top of PyPy wouldn't have helped with C API compatibility. I really hope PyPy can organize funds to hire these guys to continue working. They have accumulated massive experience on JITting the Python runtime.