title: I have problem web scraping image; when I try my code, it just says []
body: <p>This is my code:</p>
  
  <pre><code>import requests
  from bs4 import BeautifulSoup
  r = requests.get('https://www.reddit.com/r/memes/')
  soup = BeautifulSoup(r.content,'html.parser')
  post = soup.find_all('img',attr={'alt:Post image'})
  </code></pre>
  
  <p>The output is <code>[]</code>, but I don't know why. </p>