.page_source在一个webdriver实例上，您需要的是：
>>> from selenium import webdriver
>>> driver = webdriver.Firefox()
>>> driver.get('http://google.com')
>>> print(driver.page_source)
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" itemtype="http://schema.org/WebPage" itemscope=""><head><Meta name="descri
...
:before,.vscl.vslru div.vspib{top:-4px}</style></body></html>
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