Python {
    id: py
    ...
    function call_sync(func, args) {
        // XXX: Work around a call_sync bug by using evaluate.
        // https://github.com/thp/pyotherside/issues/49
        args = args.map(py.stringify).join(", ");
        return py.evaluate("%1(%2)".arg(func).arg(args));
    }
    function stringify(obj) {
        // Return Python string representation of obj.
        if (Array.isArray(obj)) {
            return "[%1]".arg(obj.map(py.stringify).join(", "));
        } else if (obj === null || obj === undefined) {
            return "None";
        } else if (typeof obj === "string") {
            return "'%1'".arg(obj.replace(/'/, "\\'"));
        } else if (typeof obj === "number") {
            return obj.toString();
        } else if (typeof obj === "boolean") {
            return obj ? "True" : "False";
        } else if (typeof obj === "object") {
            // Assume all remaining objects are dictionaries.
            return "{%1}".arg(Object.keys(obj).map(function(x) {
                return [py.stringify(x), py.stringify(obj[x])].join(": ");
            }).join(", "));
        } else {
            throw "Unrecognized argument type: %1: %2"
                .arg(obj).arg(typeof obj);
        }
    }
}