parameters: (self, pos=None)
docstring: Truncate file to size bytes.
  
          Size defaults to the current IO position as reported by tell().  Return
          the new size.
docstring_summary: Truncate file to size bytes.
docstring_tokens: Truncate file to size bytes .
function: def truncate(self, pos=None):
          """Truncate file to size bytes.
  
          Size defaults to the current IO position as reported by tell().  Return
          the new size.
          """
          self._unsupported("truncate")
function_tokens: def truncate ( self , pos = None ) : self . _unsupported ( "truncate" )