A Python script to choose from your existing tmux sessions.

tmuxhelper.py

import subprocess

def pick_tmux():
    print("Here are your active tmux sessions:\n")
    s = subprocess.run(["tmux", "ls"], capture_output=True, text=True).stdout.strip("\n")
    seshes = s.splitlines()
    pretty_list = [s [:s.find(":")] for s in seshes]
    put_numbers = enumerate(pretty_list, start=1)
    menu_dict=dict((i,j) for i,j in put_numbers)
    for key, value in menu_dict.items():
        print(key, value)
    txt = int(input("Choose the session number you'd like to run.\n"))
    subprocess.run(["tmux", "attach-session", "-t", menu_dict[txt]])

pick_tmux()