问题:用承诺来抓取两个url。

I'm scraping r/theonion and writing the titles to a text file, onion.txt. After that, I am intending to scrape r/nottheonion and writing the titles to a text file, nottheonion.txt. I succeed in writing to onion.txt, but not to nottheonion.txt. I'm scraping r/theonion and writing the titles