code: def ahead_commits(self):
      if not self.is_valid():
          return None
  
      try:
          remote, branch_name = self.get_tracking_branch_remote()
          remote_branch = "/".join([remote.name, branch_name])
  
          return list(
              self.repo.iter_commits(f"{remote_branch}..{branch_name}")
          )
      except Exception:
          return list()
  
file_path: streamlit/lib/streamlit/git_util.py
imports: import os
  import re
  from typing import Any, Optional, Tuple
  from streamlit import util
label_desc: Use image node_id 8 for calling the GitRepo obj's underlying member method code with example usage: obj.ahead_commits() and returns: None, list, list