def _function_called_str(function_name, args, kwargs):
    """Helper function to output a function call"""
    template_str = '{0}({1}, {2})'

    args_str = repr(args)[1:-1]
    kwargs_str = ', '.join('%s=%s' % (k, v)
                           for k, v in kwargs.items())
    return template_str.format(function_name, args_str,
                               kwargs_str)