lvl5.py

import requests

params = {"nothing": "12345"}
while True:
    flag = 0
    r = requests.get(
        "http://www.pythonchallenge.com/pc/def/linkedlist.php", params=params
    )
    n = len(r.text.split()) - 1
    print(r.text)
    # print(r.text.split()[n])

    if flag == 1:
        params["nothing"] = int(params["nothing"]) / 2
        flag = 0
    else:
        params["nothing"] = r.text.split()[n]
        flag = 0

    if not params[
        "nothing"
    ].isdigit():  # when we get this sentence: Yes. Divide by two and keep going.
        flag = 1

    if r.text == "peak.html":  # final answer
        break

# now visit http://www.pythonchallenge.com/pc/def/peak.html :)