Properly Handle Duplicate Kwargs

def print_kwargs(**kwargs):
    print(kwargs)

print_kwargs(**{'a': 'a', 'a': 'b'})

This works in python, but not when compiled with Cython. I think it might have something to do with the way kwargs are unpacked.

It’s good to point out that this is illegal in python, and will raise a SyntaxError(keyword argument repeated): print_kwargs(a='a', a='b')

Also worth pointing out that, Interestingly enough, this works the same in python as in cython: print({'a': 'a', 'a': 'b'}) printing {'a': 'b'}

[will-ca]

Ah, yeah. The dictionary and keyword arguments would have probably been processed and consolidated completely by CPython before being passed into the Cythonized bits.

Inlining the function call does produce the broken result:

>>> cython.inline("def f(**kwargs):\n print(kwargs)\nf(**{'a': 'a', 'a': 'b'})")
TypeError: function() got multiple values for keyword argument 'a'

[joshuahaertel]

I wonder if Python is handling the kwargs before calling the the function? Can you inline a call to the function?