code: def from_xdr_object(cls, op_xdr_object):
          
          if not op_xdr_object.sourceAccount:
              source = None
          else:
              source = encode_check(
                  'account', op_xdr_object.sourceAccount[0].ed25519).decode()
  
          line = Asset.from_xdr_object(op_xdr_object.body.changeTrustOp.line)
          limit = Operation.from_xdr_amount(
              op_xdr_object.body.changeTrustOp.limit)
  
          return cls(source=source, asset=line, limit=limit)
docs: Creates a :class:`ChangeTrust` object from an XDR Operation
          object.