Annotation-based syntax for ctypes functions · Issue #104532 · python/cpython · GitHub

Turn this:

libm = ctypes.CDLL('libm.so')
pow = libm.pow
pow.restype = ctypes.c_double
pow.argtypes = (ctypes.c_double, ctypes, c_double)

into this:

libm = ctypes.CDLL('libm.so')

@libm
def pow(x : ctypes.c_double, y : ctypes.c_double) -> c_double:
    pass

Received some good feedback on https://discuss.python.org/t/annotation-based-sugar-for-ctypes/26579
Working on implementation.

I think it's a duplicate of fixed issue #153903. Now (v3.16) something like proposed above is working, modulo different naming. E.g.:

>>> import ctypes
>>> import ctypes.util
>>> libm = ctypes.CDLL('libm.so.6')
>>> @ctypes.util.wrap_dll_function(libm)
... def sin(x: ctypes.c_double) -> ctypes.c_double:
...     pass
...     
>>> sin(1)
0.8414709848078965

Annotation-based syntax for ctypes functions · Issue #104532 · python/cpython · GitHub

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Annotation-based syntax for ctypes functions · Issue #104532 · python/cpython · GitHub

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Annotation-based syntax for ctypes functions #104532

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skirpichev commented on Aug 10, 2026

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