How to add values on specific key on a dictionary that is used as a dataframe in pandas using python

I’m trying to add a user input to a key in dictionary that is used as a dataframe but I can’t seem to make it to work. Here’s what I’ve done

`import pandas as pd

teams = {
  "Team Ahab":["Venom","Quite"],
  "Team Ishmael":[ "Big Boss","EVA"]}

team_df = pd.DataFrame(teams)

user_choice = input("What is your name:")

teams.update({"Team Ahab":user_choice})

team_reader = pd.read_csv("All Teams.txt")

` When I try to print my dataframe the user input does not come up in the text file that I used since this comes up

Team Ahab Team Ishmael, Team Miller, Team Ocelot Venom John Kaz Alex

** Please excuse me if I described my current problem badly and this is because I recently started learning python and I dont really know the proper terminlogy that I need to use**