parameters: (self, index)
return_statement: return self._stack[len(self) - index - 1]
docstring: Returns item in the stack where index=0 is the top and index=1 is
          the second item from the top.
docstring_summary: Returns item in the stack where index=0 is the top and index=1 is
          the second item from the top.
docstring_tokens: Returns item in the stack where index = 0 is the top and index = 1 is the second item from the top .
function: def __getitem__(self, index):
          """
          Returns item in the stack where index=0 is the top and index=1 is
          the second item from the top.
          """
          return self._stack[len(self) - index - 1]
function_tokens: def __getitem__ ( self , index ) : return self . _stack [ len ( self ) - index - 1 ]