parameters: (self, pos=None)
docstring: Truncate size to pos.
docstring_summary: Truncate size to pos.
docstring_tokens: Truncate size to pos .
function: def truncate(self, pos=None):
          """Truncate size to pos."""
          self._unsupported("truncate")
function_tokens: def truncate ( self , pos = None ) : self . _unsupported ( "truncate" )