code: def maintenance_branches(self):
      return [
          x["name"]
          for x in self._github_api.get_branches()
          if x["name"].startswith("maint-")
      ]
  
imports: import configparser
  import os
  import pprint
  import re
  import subprocess
  import sys
  import requests
  import getpass
  from six.moves import input
  import six
label_desc: Use image node_id 5 for calling the PullRequest obj's underlying member method code with example usage: obj.maintenance_branches() and returns: unknown