尽管驱动程序位于/usr/local/bin中，Selenium“无法找到匹配的功能集”

Question

from selenium import webdriver
driver = webdriver.Firefox()

我得到以下错误消息：

Traceback (most recent call last):
  File "/Users/kurtpeek/Documents/Scratch/selenium_getting_started.py", line 4, in <module>
    driver = webdriver.Firefox()
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/firefox/webdriver.py", line 152, in __init__
    keep_alive=True)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 98, in __init__
    self.start_session(desired_capabilities, browser_profile)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 188, in start_session
    response = self.execute(Command.NEW_SESSION, parameters)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/webdriver.py", line 252, in execute
    self.error_handler.check_response(response)
  File "/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/selenium/webdriver/remote/errorhandler.py", line 194, in check_response
    raise exception_class(message, screen, stacktrace)
selenium.common.exceptions.WebDriverException: Message: Unable to find a matching set of capabilities

[Finished in 1.2s with exit code 1]

在https://github.com/seleniumhq/Selenium/issues/3884中，似乎其他用户也遇到了类似的问题，但Selenium团队无法重现。如何让Selenium与Firefox一起工作？（它与ChromeDriver和WebDriver.chrome()实例一起工作，所以我怀疑这可能是Selenium中的一个bug）。

Answer 1

更新Firefox和Selenium为我解决了。然而，我并不假装对根本原因有一个解释。

• 更新了Firefox 48 53
• 更新到Selenium 3.4.1

我还使用homebrew重新安装/更新了geckodriver，并显式地将其用作Seleniumwebdriver的可执行文件，但结果证明没有必要减轻“无法找到匹配的功能集”错误。