parameters: (self,filename='')
docstring: updates an existing config file
docstring_summary: updates an existing config file
docstring_tokens: updates an existing config file
function: def write(self,filename=''):
          """ updates an existing config file """
          if not filename: filename = self._filename
          assert os.path.exists(filename) , 'must write over an existing config file'
          write_config(filename,self)
function_tokens: def write ( self , filename = '' ) : if not filename : filename = self . _filename assert os . path . exists ( filename ) , 'must write over an existing config file' write_config ( filename , self )