Easy wins with Cython: fast and multi-core
summary
Cython compiles .pyx to C then to a binary and adding static types turns dynamic loops into native code, demonstrated on a tax calculator over 10 million incomes. Pure Python run is about 12s, a typed Cython inner loop drops to 50 ms, and splitting work with Python 3 ThreadPoolExecutor plus with nogil threaded sections yields ~92% efficiency on four cores — the prototype actually runs and scales near linearly.
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