Converting Audacity Filter Curve EQ into transfer function and applying it to a signal via python
You can use the manage/export functionality to convert your Audacity filter preset into a text file. The file contains frequency/value pairs plus some side info. It looks like Audacity builds an 8192 FFT grid and uses a B-spline to interpolate the frequency/value pairs over the entire grid. I assume that just do an inverse FFT plus some circular time shifting to build a linear phase impulse response and than do something like fftfilt() to apply the filter.
You can just read the text file into python, parse it, and then follow the same steps.