Python Selenium chrome和safari WebDriver“；通过xpath查找元素；论网络元素

我一直在努力使我的代码在chrome（Windows7）上运行，而且它在运行OSx的safari上确实起到了作用

以下是OSx的代码：

    import time 
    from selenium import webdriver
    from selenium.webdriver.common.action_chains import ActionChains
    import re
    from bs4 import BeautifulSoup
    import pandas as pd
    import csv
    driver = webdriver.Safari()

    driver.get('https://xxxxxxxxxxxx.com')

    opp = driver.find_elements_by_xpath("//a[contains(@class, 'com_TI-B')]/@onclick")

    to_be_visited = []
    p = re.compile('contentForm\:j_idt\d+\:j_id\d+\:j_id\d+')


    for x in opp:
        doc_ids = (p.findall(x.text)[0])
        to_be_visited.append(doc_ids)

以下是Chrome的代码：

        import time 
    from selenium import webdriver
    from selenium.webdriver.common.action_chains import ActionChains
    import re
    from bs4 import BeautifulSoup
    import pandas as pd
    import csv
    driver = webdriver.Chrome()

    driver.get('https://xxxxxxxxxxxxxxxxxxxxxxxx.com')

    opp = driver.find_elements_by_xpath('//a[contains(@class,"com_TI-B")]/@onclick')

    to_be_visited = []
    p = re.compile('contentForm\:j_idt\d+\:j_id\d+\:j_id\d+')
    print(p)

    for x in opp:
        doc_ids = (p.findall(x.text)[0])
        to_be_visited.append(doc_ids)

这是我第一次使用selenium，我经常会遇到如下错误

xpath表达式“//a[的结果包含（@class，“com_TI-B”） )]/@onclick“是：[object Attr]。它应该是一个元素

我想知道chrome和safari的webdriver之间是否有区别