一元的操作数类型错误： -： 'WebElement'

问：

我有以下代码，我正在 spyder 上运行，以使用 chrome webdriver 提取评论。 我收到此错误消息：一元操作数类型错误 -： 'WebElement' 你能帮我解决这个问题吗？ 提前致谢。

import time
from selenium import webdriver
from selenium.webdriver.common.by import By
from sys import exit

def log(log_text):
    log_text = str(time.strftime("%Y.%m.%d %H:%M:%S")) + " ➾ " + log_text
    print(log_text)
    log_file = open("log.txt", "a", encoding='utf-8')
    log_file.write(log_text + "\n")
    log_file.close()

global_delay = 0.5
driver = webdriver.Chrome()
log('Bu program Can Tarafından Yapılmıştır.')
log('https://fastuptime.com ve https://speedsmm.com üzerinden bize ulaşabilirsiniz.')
log('Program başlatıldı')

urun_url =  input("Ürün Linki Sonuna / Koymayın: ") #'https://www.trendyol.com/trendypassion/sirt-pusula-baskili-tshirt-p-260271556'  Ürün URL NOT SONUNA / KOYMAYIN

try:
    driver.get(urun_url + "/yorumlar")
    time.sleep(5)
    kac_yorum_var = -driver.find_element(by=By.XPATH, value='/html/body/div[1]/div[3]/div/div/div[2]/div/div[2]/div[1]/div/div[2]/span[2]')
    kac_yorum_var = kac_yorum_var.replace(" Yorum", "")
    log('Toplam ' + kac_yorum_var + ' yorum var.')
    for i in range(int(kac_yorum_var)):
        try:
            yorum = driver.find_element_by_xpath('/html/body/div[1]/div[3]/div/div/div[2]/div/div[2]/div[3]/div[4]/div[' + str(i) + ']/div[1]/div/p').text
            log('Yorum: '+ yorum)
            yorum_file = open("yorumlar.txt", "a", encoding='utf-8')
            yorum_file.write(yorum + "\n")
            driver.execute_script("window.scrollTo(0, document.body.scrollHeight);")
            time.sleep(global_delay)
        except:
            continue
except Exception as e:
    log('Hata: ' + str(e))
    log('Program sonlandı')
    driver.quit()
    exit()

我想我必须在 url 链接中更改一些内容，但我在这里找不到答案。