def remove_bots_posts(df, bots=["AutoModerator", "RemindMeBot", "WikiTextBot", "youtubefactsbot", "RedditNiobioBot", "NemLiNemLereiBot"]):
    """Removes bots posts.

    Parameters:
    df (pandas.DataFrame): dataset to remove bots' posts

    bots (list) - optional: list of str with bot names to look for and remove respective posts

    Returns:
    Pandas.DataFrame: dataset without posts made by bots
    
    """
    df_without_bot_posts = df[~df.author.isin(bots)]

    return df_without_bot_posts