parameters: (self)
docstring: initialize your data structure here.
docstring_summary: initialize your data structure here.
docstring_tokens: initialize your data structure here .
function: def __init__(self):
          """
          initialize your data structure here.
          """
          self.st = []
          self.mst = []
function_tokens: def __init__ ( self ) : self . st = [ ] self . mst = [ ]