Here are all the snippets available using this library:

from bs4 import BeautifulSoup html = """ <!DOCTYPE html> <head> <title>My page</title> </head> <body> <p class="title"><b>My page</b></p> <p class="story">My sisters: <a href="" class="sister" id="link1">Maria</a> <a href="" class="sister" id="link2">Diana</a> </p> </body> </html> """ def insert_sister(html: str, name: str) -> BeautifulSoup: """ Inserts a new a tag in the html document, representing a new sister. """ soup = BeautifulSoup(html, "html.parser") # Find the <p> tag with class "story" story_paragraph = soup.find("p", class_="story") last_a_tag = story_paragraph.find_all("a")[-1] new_link_id = int(last_a_tag["id"][-1]) + 1 # Create a new sister link new_sister_link = soup.new_tag( "a", href=f"{name}", class_="sister", id=f"link{new_link_id}" ) new_sister_link.string = name.capitalize() space_string = soup.new_string(" ") # Insert the space and the new sister link before the last <a> tag in the story paragraph last_a_tag.insert_after(space_string) space_string.insert_after(new_sister_link) return soup