def present(self, value):
for k, v in list(self.special.items()):<EOL><INDENT>if v == value:<EOL><INDENT>return k<EOL><DEDENT><DEDENT>return self.to_literal(value, *self.args, **self.kw)<EOL>
Return a user-friendly representation of a value.

        Lookup value in self.specials, or call .to_literal() if absent.