@staticmethod
def __replace_base_variables(text, req_len, idx):
    """
        Replace i and n in text with index+1 and req_len.

        :param text: base text to modify
        :param req_len: amount of required resources
        :param idx: index of resource we are working on
        :return: modified string
        """
    return text.replace('{i}', str(idx + 1)).replace('{n}', str(req_len))
