This code generates a file with offsets and sizes of Geometry Dash cubes :D.

GDIconOffsetGenerator.py

import os, plistlib, json

plists = list(filter(lambda x: x.endswith(".plist"), os.listdir()))

icons = {}
for icon in plists:
    with open(icon, "rb") as f:
        xml = plistlib.load(f, fmt=plistlib.FMT_XML)["frames"]
        for key, value in xml.items():
            icons[key] = {
                "spriteOffset": [int(float(i)) for i in value["spriteOffset"][1:-1].split(",")],
                "spriteSize": [int(float(i)) for i in value["spriteSize"][1:-1].split(",")]
                }

with open("offsets.json", "w") as f:
    json.dump(icons, f)