@classmethod<EOL><INDENT>def camel_to_snake(self, s):<DEDENT>
return self._underscore_re2.sub(r'<STR_LIT>', self._underscore_re1.sub(r'<STR_LIT>', s)).lower()<EOL>
Constructs nice dir name from class name, e.g. FooBar => foo_bar.

        :param s: The string which should be converted to snake_case.