def METHOD_NAME(func):
    """
    Decorator for measuring function's running time.
    """
    def measure_time(*args, **kw):
        start_time = time.time()
        result = func(*args, **kw)
        print(
            "Processing time of %s(): %.2f seconds."
            % (func.__qualname__, time.time() - start_time)
        )
        return result
    return measure_time