方法1：

from selenium import webdriver
from pathlib import Path

driver = webdriver.Chrome()

file_path = Path(Path.cwd(), '上传下载.html')
driver.get('file:///' + str(file_path))

方法2：

from pathlib import Path
from selenium import webdriver

driver = webdriver.Chrome()

driver.get('file:///' + str(Path(Path.cwd(), '弹窗.html')))