Generate the code and return it as a string.

def to_code(self, context: Context =None):
        """
        Generate the code and return it as a string.
        """
        # Do not override this method!

        context = context or Context()
        for imp in self.imports:
            if imp not in context.imports:
                context.imports.append(imp)

        counter = Counter()
        lines = list(self.to_lines(context=context, counter=counter))

        if counter.num_indented_non_doc_blocks == 0:
            if self.expects_body_or_pass:
                lines.append("    pass")
            elif self.closed_by:
                lines[-1] += self.closed_by
        else:
            if self.closed_by:
                lines.append(self.closed_by)

        return join_lines(*lines) + self._suffix