Pure Python first pass?

[Dapid]

Sometimes I find a small function missing from Pythran. Implementing it in C++ may be a little bit challenging, but I can often bypass it by copying the source code into my own function.

For example np.fft.fftshift is missing from Pythran, but it is a simple wrapper around np.roll, so simply dropping the definition in my code works:

def fftshift(x):
    shift = x.shape[0] // 2
    return np.roll(x, shift, 0)

[Caveat]

Would it be possible to have Pythran read from a library of Python code? So, if I use np.fft.fftshift, the first pass would translate to the previous function (vendored in Pythran), and the second pass would generate the C++ code. This makes adding more functions and plugging gaps much easier, since it doesn't require to write C++.

[serge-sans-paille]

I like that idea. It would make contributions easier, and would pave the way for external library support.