code: def is_pull_request(issue):
      """Return True if the given issue is a pull request."""
      return bool(issue.get("pull_request", {}).get("html_url", None))
  
imports: import getpass
  import json
  import os
  import re
  import sys
  import requests
label_desc: Use image node_id 12 for calling a global function with example usage: is_pull_request(issue) and returns: bool