parameters: (self, data)
docstring: Adds data to the end of buffer
docstring_summary: Adds data to the end of buffer
docstring_tokens: Adds data to the end of buffer
function: def extend(self, data):
          """Adds data to the end of buffer"""
          self._buf.extend(data)
function_tokens: def extend ( self , data ) : self . _buf . extend ( data )