parameters: (self, fn, optstr)
docstring: Make an entry in the options_table for fn, with value optstr
docstring_summary: Make an entry in the options_table for fn, with value optstr
docstring_tokens: Make an entry in the options_table for fn with value optstr
function: def default_option(self, fn, optstr):
          """Make an entry in the options_table for fn, with value optstr"""
  
          if fn not in self.lsmagic():
              error("%s is not a magic function" % fn)
          self.options_table[fn] = optstr
function_tokens: def default_option ( self , fn , optstr ) : if fn not in self . lsmagic ( ) : error ( "%s is not a magic function" % fn ) self . options_table [ fn ] = optstr