Ошибка: TypeError: string indices must be integers

В чем ошибка?

import requests
from bs4 import BeautifulSoup
import csv

FILE="games.csv"

def get_html(url):
    r = requests.get(url)
    r.encoding = 'utf8'
    return r.text



def get_link(html):
    soup = BeautifulSoup(html, 'lxml')
    video = soup.find('div', attrs={"class": "highlight_player_item", "data-mp4-hd-source": True})

    for item in video:
        games.append({'video':item["data-mp4-hd-source"]})


def save_file(items, path):
    with open(path, 'w', newline='', encoding='cp1251') as file:
        writer = csv.writer(file, delimiter=';')
        writer.writerow(['VIDEOS'])
        for item in items:
            writer.writerow([item['video']])
games=[]
with open("racesru.csv", newline='', encoding='cp1251') as csvfile:
    reader = csv.reader(csvfile, delimiter=';')
    for row in reader:
        link = row[4]
        if (link != '0' and link != 'LINK'):
            url = link
            print(url)
            print(games)
            save_file(games, FILE)
            get_link(get_html(str(url)))