[OT] How to produce IIR filter coefficients from a set of points describing the frequency response

Hi all,

The subject asks the question... What I want to know is if there's an
easy way using something like pylab and numpy to produce a set of
coefficients for an IIR filter from a given frequency response.
I've read on the internet that matlab has the invresz function which
does this, but is there an easy way with free software?

Cheers
Andrés

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