code: def _init_externals():
      
      if __version__ == 'git':
          sys.path.insert(0, osp.join(osp.dirname(__file__), 'ext', 'gitdb'))
  
      try:
          import gitdb
      except ImportError:
          raise ImportError("'gitdb' could not be found in your PYTHONPATH")
docs: Initialize external projects by putting them into the path