报错：selenium.common.exceptions.WebDriverException: Message: Expected browser binary location,
 but unable to find binary in default location, no 'moz:firefoxOptions.binary' capability provided, 
and no binary flag set on the command line

原因：未找到浏览器的位置

解决办法：

from selenium.webdriver.firefox.firefox_binary import FirefoxBinary

binary = FirefoxBinary('path/to/firefox.exe')
driver = webdriver.Firefox(firefox_binary=binary)