unstack_dict.py

def unstack(x, prefix=""):
    if isinstance(x, dict):
        out = {}
        for key, val in x.items():
            z = unstack(val, prefix=key+'.')
            if isinstance(z, dict):
                for subkey, subval in z.items():
                    out[prefix+subkey] = subval
            else:
                out[prefix+key] = val
        return out
    elif isinstance(x, list):
        return unstack({str(i): val for i,val in enumerate(x)}, prefix=prefix)
    else:
        return x