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It reminds me every fast python library is not written in python!

For many users, the important language is the one you use to interface with the language, not the language the library was written in. :)

Not contradicting your point, btw.

Or, they're written in pure python and run under PyPy.

^ this :)

I once solved a performance problem by using the pure-python mysql drivers and pypy, rather than the normal c-wrapped drivers and python. The result was actually faster than a Java version of the same program using the normal JDBC drivers.

Something feels deeply wrong with a world where database performance can depend on basic string interpolation performance deep in your client-side mysql drivers... Its soul-destroying to see a naive 'safe' parameterization code coming up hottest in Java profiling results.

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