使用pyppteer，总是报错
代码如下：
import asyncio
from pyppeteer import launch
from lxml import etree
async def main():
browser = await launch()
page = await browser.newPage()
await page.goto('http://quotes.toscrape.com/js/')
page_text = await page.content()
tree = etree.HTML(page_text)
div_list = tree.xpath('//div[@class="quote"]')
print(len(div_list))
await browser.close()
asyncio.get_event_loop().run_until_complete(main())
报错如下：
RuntimeError Traceback (most recent call last)
~\AppData\Local\Temp/ipykernel_3712/1847197767.py in
13 await browser.close()
14
---> 15 asyncio.get_event_loop().run_until_complete(main())
d:\python\python38\lib\asyncio\base_events.py in run_until_complete(self, future)
590 """
591 self._check_closed()
--> 592 self._check_running()
593
594 new_task = not futures.isfuture(future)
d:\python\python38\lib\asyncio\base_events.py in _check_running(self)
550 def _check_running(self):
551 if self.is_running():
--> 552 raise RuntimeError('This event loop is already running')
553 if events._get_running_loop() is not None:
554 raise RuntimeError(
RuntimeError: This event loop is already running
