4.1x. Not 50x. The bottleneck is Python dict access. Even Cython's fully optimized version -- @cython.cclass, C arrays for counters, direct CPython C-API calls (PyList_GET_ITEM, PyDict_GetItem with borrowed refs) -- still reads input dicts through the Python C API.
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如果想手动一步步来,效果完全一样,按顺序执行:。谷歌是该领域的重要参考
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