list-youtube-commenters.py

import requests

url = input("YouTube URL: ")
filename = "commenters.txt"
#filename = input("Save to: ")

session = requests.Session()

headers = {
	"User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.103 Safari/537.36",
	"X-YouTube-Client-Name": "1",
	"X-YouTube-Client-Version": "2.20190420"
}

resp = session.get(url, headers=headers)
xsrf_token = resp.text.split("XSRF_TOKEN\":\"")[1].split("\"")[0]
ctoken = resp.text.split("\"nextContinuationData\":{\"continuation\":\"")[1].split("\"")[0]
itct = resp.text.split("\"{}\",\"clickTrackingParams\":\"".format(ctoken))[1].split("\"")[0]

commenters = []

while True:
	print("Scrolling. please wait... ({})".format(len(commenters)))
	params = {
		"action_get_comments": "1",
		"pbj": "1",
		"ctoken": ctoken,
		"continuation": ctoken,
		"itct": itct
	}
	data = {
		"session_token": xsrf_token
	}
	resp = session.post("https://www.youtube.com/comment_service_ajax", params=params, headers=headers, data=data)
	jsonResp = resp.json()
	doBreak = False
	if "continuationContents" in jsonResp["response"] and "continuations" in jsonResp["response"]["continuationContents"]["itemSectionContinuation"]:
		ctoken = jsonResp["response"]["continuationContents"]["itemSectionContinuation"]["continuations"][0]["nextContinuationData"]["continuation"]
	else:
		doBreak = True

	if "continuationContents" in jsonResp["response"] and "contents" in jsonResp["response"]["continuationContents"]["itemSectionContinuation"]:
		for content in jsonResp["response"]["continuationContents"]["itemSectionContinuation"]["contents"]:
			commenters.append(content["commentThreadRenderer"]["comment"]["commentRenderer"]["authorText"]["simpleText"])

	if doBreak:
		break

commenters = list(set(commenters))

open(filename, "w").write("\n".join(commenters).strip())
print("Warning: YouTube stopped sending a comment info. This means the script has fetch all comments correctly, or YouTube just blocked this script to fetch a comment just now.")
print("Saved {} name(s) (removed duplicates) to {}".format(len(commenters), filename))