@staticmethod
def run_ndctl_list_val(json_op, field):
    """
        Get the value of a field in given json

        :param json_op: Input Json object
        :param field: Field to find the value from json_op object

        :rtype: Found value type, None if not found
        """
    for key, value in json_op.items():
        if key == field:
            return value
    return None
