def get_topics(lda_model):
    """get_topics. Extract list of topics with top twenty words.

    Parameters
    ----------
    lda_model : gensim.models.ldamulticore.LdaMulticore
        Trained LDA model. Takes output from get_model.
    """
    topics = lda_model.show_topics(num_topics = -1, num_words=20, formatted=False)
    return topics