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PERF: Use interned strings for Python attr methods: "real" and "imag" #29107

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MaanasArora
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Adds "real" and "imag" interned strings and uses them to get complex part attributes of Python objects in PyArray_Round, as recommended in #27120.

@eendebakpt
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I found a few more occurrences of "real" and "imag" in the codebase:

ret = PyObject_GetAttrString(obj, "real");

ret = PyObject_GetAttrString(obj, "imag");

We might as well change those.

The changes itself look good. Out of curiosity: do you have benchmarks that show the impact of this change?

@MaanasArora MaanasArora changed the title PERF: Use interned strings for Python attrs in PyArray_Round PERF: Use interned strings for Python attr methods: "real" and "imag" Jun 1, 2025
@MaanasArora
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Makes sense @eendebakpt, just did that, thanks.

Not yet, but I'll try to benchmark soon.

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