__ctype_{be,le}__ attributes missing for ctypes.c_*_complex types

Bug report

Bug description:

I was working on adding support for the fancy new complex ctypes types to numpy.ctypeslib ¹, but ran into the problem that the c_{float,double,longdouble}_complex types do not have the __ctype_{be,le}__ attributes that e.g. their non-complex counterparts have:

>>> import ctypes as ct
>>> ct.c_float.__ctype_le__
<class 'ctypes.c_float'>
>>> ct.c_float_complex.__ctype_le__
Traceback (most recent call last):
  File "<python-input-2>", line 1, in <module>
    ct.c_float_complex.__ctype_le__
AttributeError: type object 'c_float_complex' has no attribute '__ctype_le__'

I checked Python 3.14.4 and 3.15.0a8.

CPython versions tested on:

3.14

Operating systems tested on:

Linux

Linked PRs

NumPy relies on these attributes when converting e.g. numpy.dtype(">d") to ctypes.c_double.__ctype_be__ using numpy.ctypeslib.as_ctypes_type (docs). ↩

c_longdouble_complex

Note, that these attributes are not available on c_longdouble as well. I don't see how we can change this.

pythongh-148464: Add missing ``__ctype_le/be__`` attributes for compl…

c_longdouble_complex

Note, that these attributes are not available on c_longdouble as well. I don't see how we can change this.

Eh, long double sucks anyway 😛. I'm already happy that you're able to fix the complex float and double cases.

gh-148464: Add missing ``__ctype_le/be__`` attributes for complex typ…

pythongh-148464: Add missing ``__ctype_le/be__`` attributes for compl…

@skirpichev

@skirpichev:

Note, that these attributes are not available on c_longdouble as well. I don't see how we can change this.

I'm curious. Is it because Python doesn't provide PyFloat_Pack8()/PyFloat_Unpack8() functions for long double?

Yes, as there is not definite format for long doubles.

[3.14] gh-148464: Add missing ``__ctype_le/be__`` attributes for comp…

Thanks all

pythongh-148464: Add missing ``__ctype_le/be__`` attributes for compl…

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`__ctype_{be,le}__` attributes missing for `ctypes.c_*_complex` types #148464

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__ctype_{be,le}__ attributes missing for ctypes.c_*_complex types #148464

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Bug report

Bug description:

CPython versions tested on:

Operating systems tested on:

Linked PRs

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skirpichev commented on Apr 13, 2026

jorenham commented on Apr 13, 2026

vstinner commented on Apr 17, 2026

skirpichev commented on Apr 17, 2026

jorenham commented on Apr 23, 2026

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`__ctype_{be,le}__` attributes missing for `ctypes.c_*_complex` types #148464