title: Getting error that USER_AGENT is not defined (Python 3)
body: <p>I'm trying to scrape the information inside an 'iframe' tag. When I execute this code, it says that 'USER_AGENT' is not defined. How can I fix this?</p>
  
  <pre><code>import requests
  from bs4 import BeautifulSoup
  
  page = requests.get("https://etherscan.io/token/0x168296bb09e24a88805cb9c33356536b980d3fc5#balances" + "/token/generic-tokenholders2?a=0x168296bb09e24a88805cb9c33356536b980d3fc5&amp;amp;s=100000000000000000", headers=USER_AGENT, timeout=5)
  soup = BeautifulSoup(page.content, "html.parser")
  test = soup.find_all('iframe')
  </code></pre>