python3-backcall

If code lets other people supply callback functions, it is important
to specify the function signature that is being expected, and to
check that functions support that. Adding extra parameters later
would break other peoples code unless one is careful.
backcall provides a way of specifying the callback signature using a
prototype function.

          

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License: BSD-3-Clause
URL: https://github.com/takluyver/backcall