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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def __default(self, ast_token):
 """Handle tokens inside the list or outside the list."""

        if self.list_level == 1:
            if self.list_entry is None:
                self.list_entry = ast_token
            elif not isinstance(ast_token, type(self.list_entry)):
                self.final_ast_tokens.append(ast_token)
        elif self.list_level == 0:
            self.final_ast_tokens.append(ast_token)