main.py

from ytmusicapi import YTMusic
import requests
import json

spotify_playlist = #####
ytmusic_playlist = #####

yt = YTMusic('oauth.json')

headers = {
        "Authorization": "Basic NzIxZDZmNjcwZjA3NGIxNDk3ZTc0ZmM1OTEyNWE2ZjM6ZWZkZGMwODNmYTk3NGQzOWJjNjM2OWE4OTJjMDdjZWQ=",
        "Content-Type": "application/x-www-form-urlencoded"
}
params = {
        "grant_type": "client_credentials"
}

authorization_token = requests.post("https://accounts.spotify.com/api/token", headers = headers, params = params).json()['access_token']
print("authorization_token found: " + authorization_token)
headers = {
        "Authorization": "Bearer " + authorization_token
        }
spotifyurl = f'https://api.spotify.com/v1/playlists/{spotify_playlist}/tracks'
while spotifyurl:
    r = requests.get(spotifyurl, headers=headers)
    data = r.json()
    for i in data['items']:
        search = i['track']['name']
        for j in i['track']['artists']:
            search = search + " " + j['name']
        print(search)
        res = yt.search(search, 'songs', limit = 1)
        print("id found: " + res[0]['videoId'])
        yt.add_playlist_items(ytmusic_playlist, [res[0]['videoId']])
    spotifyurl = data['next']