from Usmap import Usmap
import json

with open("xyz.usmap", "rb") as f:
    data = Usmap(f).read()

# from bytes or byte array
import io

data = Usmap(io.BytesIO(b'')).read()

# writing to json
jsondict = data.GetValue() # get json serializable dict
with open("Mappings.json", "w") as f:
    json.dump(jsondict, f, indent=4)