使用geckodriver和python脚本获取Selenium

我试图让Selenium使用Mozilla Firefox geckodriver使用python脚本，但是我得到了一个关于二进制位置的错误

我首先下载tar.giz文件，解压缩，然后创建geckodriver到/usr/bin和/usr/local/bin的sym链接，使其位于$PATH dirs中：

wget https://github.com/mozilla/geckodriver/releases/download/v0.28.0/geckodriver-v0.28.0-linux64.tar.gz -O /home/myuser/geckodriver.tar.gz
tar -xzf /home/myuser/geckodriver.tar.gz
sudo cp geckodriver /opt/geckodriver
sudo chmod 777 /opt/geckodriver
sudo ln -fs /opt/geckodriver /usr/bin/geckodriver && sudo ln -fs /opt/geckodriver /usr/local/bin/geckodriver

然后，我的python脚本开始如下所示：

from selenium.webdriver.firefox.options import Options as FirefoxOptions
from selenium import webdriver

options = FirefoxOptions()
selenium = webdriver.Firefox(options=options)

错误：

home/myuser/envs/lib/python3.6/site-packages/selenium/webdriver/firefox/webdriver.py in __init__(self, firefox_profile, firefox_binary, timeout, capabilities, proxy, executable_path, options, service_log_path, firefox_options, service_args, desired_capabilities, log_path, keep_alive)
    172                 command_executor=executor,
    173                 desired_capabilities=capabilities,
--> 174                 keep_alive=True)
    175 
    176         # Selenium remote

/home/myuser/envs/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py in __init__(self, command_executor, desired_capabilities, browser_profile, proxy, keep_alive, file_detector, options)
    155             warnings.warn("Please use FirefoxOptions to set browser profile",
    156                           DeprecationWarning, stacklevel=2)
--> 157         self.start_session(capabilities, browser_profile)
    158         self._switch_to = SwitchTo(self)
    159         self._mobile = Mobile(self)

/home/myuser/envs/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py in start_session(self, capabilities, browser_profile)
    250         parameters = {"capabilities": w3c_caps,
    251                       "desiredCapabilities": capabilities}
--> 252         response = self.execute(Command.NEW_SESSION, parameters)
    253         if 'sessionId' not in response:
    254             response = response['value']

/home/myuser/envs/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py in execute(self, driver_command, params)
    319         response = self.command_executor.execute(driver_command, params)
    320         if response:
--> 321             self.error_handler.check_response(response)
    322             response['value'] = self._unwrap_value(
    323                 response.get('value', None))

/home/myuser/envs/lib/python3.6/site-packages/selenium/webdriver/remote/errorhandler.py in check_response(self, response)
    240                 alert_text = value['alert'].get('text')
    241             raise exception_class(message, screen, stacktrace, alert_text)
--> 242         raise exception_class(message, screen, stacktrace)
    243 
    244     def _value_or_default(self, obj, key, default):

SessionNotCreatedException: 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

安装geckodriver时我做错什么了吗？我是否需要重命名为firefox目录或类似的名称，以便在$PATH中识别它

谢谢