code: def discover_filename(label, scopes=None):
      '''
      Check the filesystem for the existence of a .plist file matching the job label.
      Optionally specify one or more scopes to search (default all).
  
      :param label: string
      :param scope: tuple or list or oneOf(USER, USER_ADMIN, DAEMON_ADMIN, USER_OS, DAEMON_OS)
      '''
      if scopes is None:
          scopes = [k for k in PLIST_LOCATIONS]
      elif not isinstance(scopes, (list, tuple)):
          scopes = (scopes, )
      for thisscope in scopes:
          plistfilename = compute_filename(label, thisscope)
          if os.path.isfile(plistfilename):
              return plistfilename
      return Nonf discover_filename(label, scopes=None):
      '''
      Check the filesystem for the existence of a .plist file matching the job label.
      Optionally specify one or more scopes to search (default all).
  
      :param label: string
      :param scope: tuple or list or oneOf(USER, USER_ADMIN, DAEMON_ADMIN, USER_OS, DAEMON_OS)
      '''
      if scopes is None:
          scopes = [k for k in PLIST_LOCATIONS]
      elif not isinstance(scopes, (list, tuple)):
          scopes = (scopes, )
      for thisscope in scopes:
          plistfilename = compute_filename(label, thisscope)
          if os.path.isfile(plistfilename):
              return plistfilename
      return None
docs: Check the filesystem for the existence of a .plist file matching the job label.
      Optionally specify one or more scopes to search (default all).
  
      :param label: string
      :param scope: tuple or list or oneOf(USER, USER_ADMIN, DAEMON_ADMIN, USER_OS, DAEMON_OS)