def automated_readability_index(n_chars, n_words, n_sents):
    """https://en.wikipedia.org/wiki/Automated_readability_index"""
    return 4.71 * (n_chars / n_words) + 0.5 * (n_words / n_sents) - 21.43
dataset/ETHPy150Open chartbeat-labs/textacy/textacy/text_stats.py/automated_readability_index/original