如何将变量传递给python（selenium Webdriver）包函数？

How to pass a variable to python (selenium Webdriver) package function?

我有以下要求。我应该能够动态地向要传递的参数提供端口号

1	webdriver.remote.webdriver.WebDriver(<PARAMS HERE>)

我试过很多种组合，但没能搞清楚

1 2	command ="command_executor='http://127.0.0.1:4444/wd/hub', desired_capabilities=webdriver.DesiredCapabilities.HTMLUNIT" driver = webdriver.remote.webdriver.WebDriver(command)

我得到以下错误：

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Traceback (most recent call last):
File"sel2.py", line 38, in <module>
driver = webdriver.remote.webdriver.WebDriver(command)

File"/home/sysqe/my36project/lib/python3.6/site-packages/selenium/webdriver/remote/webdriver.py", line 134, in __init__
raise WebDriverException("Desired Capabilities can't be None")
selenium.common.exceptions.WebDriverException: Message: Desired Capabilities can't be None

它应该能够插入var命令并将参数放在适当的位置。