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This is a request to expose the `callback API`_ of GNU readline in the readline module in the Python library.
.. _callback API: http://cnswww.cns.cwru.edu/php/chet/readline/readline.html#SEC41
This interface is suitable for asynchronous use, such as with twisted.
It is possible to expose the functions on Unix with ctypes::
 import readline
 import ctypes
 rl_lib = ctypes.cdll.LoadLibrary("libreadline.so.5")
 readline.callback_handler_remove = rl_lib.rl_callback_handler_remove
 readline.callback_read_char = rl_lib.rl_callback_read_char
 # the callback needs special treatment:
 rlcallbackfunctype = ctypes.CFUNCTYPE(ctypes.c_void_p, ctypes.c_char_p)
 def setcallbackfunc(prompt, thefunc):
 rl_lib.rl_callback_handler_install(prompt, rlcallbackfunctype(thefunc))
 readline.callback_handler_install = setcallbackfunc
but it would be much better to expose them "officially".