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selenium无法打开firefox

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所以,我正在使用像这样的硒:

#!/usr/bin/env python

  from pyvirtualdisplay import Display
  from selenium import webdriver
  from selenium.webdriver.common.desired_capabilities import DesiredCapabilities

  firefox_capabilities = DesiredCapabilities.FIREFOX
  firefox_capabilities['marionette'] = True

  browser = webdriver.Firefox(capabilities=firefox_capabilities)

  # Set screen resolution to 1366 x 768 like most 15" laptops
  display = Display(visible=0, size=(1366, 768))
  display.start()


  # Sets the width and height of the current window
  browser.set_window_size(1366, 768)

  # Open the URL
  browser.get('http://www.vionblog.com/')

  # set timeouts
  browser.set_script_timeout(30)
  browser.set_page_load_timeout(30) # seconds

  # Take screenshot
  browser.save_screenshot('vionblog.png')

  # quit browser
  browser.quit()

  # quit Xvfb display
  display.stop()

但是当我跑它时,它说:

Traceback(最近一次调用最后一次):文件“a.py”,第10行,在browser = webdriver.Firefox(capabilities = firefox_capabilities)文件“/usr/local/lib/python2.7/dist-packages/selenium/webdriver / firefox/webdriver.py“,第145行,在init self.service.start()文件”/usr/local/lib/python2.7/dist-packages/selenium/webdriver/common/service.py“,第81行,在启动os.path.basename(self.path),self.start_error_message)selenium.common.exceptions.WebDriverException:消息:'geckodriver'可执行文件需要在PATH中 .

谁能帮我这个?

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