Merge signatures of two functions with Advanced Hackery.
This small library uses Advanced Python Hackery to change the signature of a function to be a mixture of itself and a function that it wraps. It’s like functools.wraps, but it allows the wrapped function to add its own arguments into the mix.
from merge_args import merge_args def old(foo, bar): """This is old's docstring.""" print(foo, bar) return foo + bar @merge_args(old) def new(prefix, foo, *args, **kwargs): return old(prefix + foo, *args, **kwargs)
If you then run help(new), this is the output:
Help on function new in module __main__: new(prefix, foo, bar) This is old's docstring.
How it works?
I wrote a detailed blog post, describing the ins and outs of how this package works:
This module was inspired by F4D3C0D3 on #python (formerly on freenode IRC).
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