[python-package] remove unnecessary allocations in ctypes code #6111
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jameslamb
requested review from
guolinke,
shiyu1994 and
jmoralez
as code owners
guolinke
approved these changes
Sep 25, 2023
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A few places in the Python package use a pattern like the following:
That's identical to the following ...
... except that it involves allocating, unpacking, and then immediately freeing a list object.
This PR proposes removing those unnecessary allocations, to make those code paths slightly faster and reduce their memory usage a tiny bit.
Notes for reviewers
Docs on
ctypes.c_char_p()accepting a memory address as an int: https://docs.python.org/3/library/ctypes.html#ctypes.c_char_p