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      "title": "double eval in For List Iter in Vyper"
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Si bien la expresi\u00f3n del iterador no puede producir m\u00faltiples escrituras, puede consumir efectos secundarios producidos en el cuerpo del bucle (por ejemplo, leer una variable de almacenamiento actualizada en el cuerpo del bucle) y, por lo tanto, provocar un comportamiento inesperado del programa. Espec\u00edficamente, las lecturas en iteradores que contienen una ifexp (por ejemplo, `for s: uint256 in ([read(), read()] if True else [])`) pueden intercalar lecturas con escrituras en el cuerpo del bucle. Los bucles for de Vyper permiten dos tipos de destinos de iterador, a saber, el `range()` incorporado y un tipo iterable, como SArray y DArray. Durante la generaci\u00f3n de c\u00f3digo, se requiere que las listas iterables no produzcan ning\u00fan efecto secundario (en el siguiente c\u00f3digo, `range_scope` obliga a que `iter_list` se analice en un contexto constante, que se verifica con `is_constant`). 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