Martin Panter added the comment:
It looks like ctypes uses ffi_closure_alloc() to allocate an executable
function on demand. So it should be possible for readline to also call libffi
and do this, but certainly not trivial.
>>> from ctypes import *
>>> @CFUNCTYPE(c_int, c_int, c_int)
... def operate_and_get_next(count, char):
... print("Boo!", count, char)
... return 0
...
>>> libreadline = CDLL("libreadline.so.6")
>>> libreadline.rl_add_defun("operate-and-get-next", operate_and_get_next,
>>> ord("O") & 0x1F)
0
>>> # Press Ctrl-O ==> Boo! 1 15
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue22228>
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