parameters: (self, root=None)
docstring: :param root: root path of the files
docstring_summary: :param root: root path of the files
docstring_tokens: : param root : root path of the files
function: def __init__(self, root=None):
          '''
          :param root: root path of the files
          '''
          self._root = root
function_tokens: def __init__ ( self , root = None ) : self . _root = root