reorder a designspace file based on values

reorderDesignspaceFiles.py

from fontTools.designspaceLib import DesignSpaceDocument

dspPath = 'path/to/file.designspace'
tempPath = dspPath.replace(".designspace","-reordered.designspace")

dsp = DesignSpaceDocument.fromfile(dspPath)
instanceMap = {}
for instance in dsp.instances:
    instanceMap[instance] = tuple(instance.designLocation.values())
reordered = sorted(instanceMap.items(), key=lambda x: x[1])
dsp.instances = [inst for (inst,vals) in reordered]
dsp.write(tempPath)