parameters: (path, root)
docstring: If 'path' is relative, it is rooted at 'root'. Otherwise, it's unchanged.
docstring_summary: If 'path' is relative, it is rooted at 'root'. Otherwise, it's unchanged.
docstring_tokens: If path is relative it is rooted at root . Otherwise it s unchanged .
function: def root (path, root):
      """ If 'path' is relative, it is rooted at 'root'. Otherwise, it's unchanged.
      """
      if os.path.isabs (path):
          return path
      else:
          return os.path.join (root, path)
function_tokens: def root ( path , root ) : if os . path . isabs ( path ) : return path else : return os . path . join ( root , path )