Welcome to the new installment of my series of Coding Quizzes, in which you will be able to test your knowledge and skills about programming and software development in a simple and fun way. If you want to learn more about it visit my blog here on Hive and the first post where I introduced it.
@eniolwSolution to the previous quiz: None. This quiz is a small nod to one of my favourite games after chess: The Legend of Zelda. First we define two sets: player1 and player2, each containing titles from famous video games of this franchise.
However, it is in line 10 where we see the heart of the matter: played = player1.intersection_update(player2). What the intersection_update method does is to select the common elements of both sets and overwrite the first one with those elements. So, if we print the content of player1 we will see that it consists of {"Majora's Mask"}, as it is the only element that both sets have in common.
Now, don't be confused by the way the two common strings were hardcoded in the script: "Majoras's Mask" (line 3) is exactly the same as 'Majora\'s Mask' (line 8), because in the second one, the backslash followed by ' is one of the many Python escape sequences and serves to use that character inside a string delimited with that same character, making the notation legal.
But why played is None then? Because contrary to what you might think, the intersection_update method does not return a new set, but just updates one of the existing sets, so that method actually returns None. This is a misleading use, but not in vain, as it is a way to make a potential error explicit.
Majoras's Mask, by the way, is my favourite of all the Zelda games I've played. How about you?
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Bienvenido a mi nueva serie de Quizzes de Programaci贸n, en la cual podr谩s poner a prueba tus conocimientos y habilidades sobre programaci贸n y desarrollo de software de una manera sencilla y divertida. Si quieres aprender m谩s sobre ella visita mi blog aqu铆 en Hive y el primer post donde la present茅.
@eniolwSoluci贸n al quiz anterior: None. Este quiz es un peque帽o gui帽o a uno de mis juegos favoritos despu茅s del ajedrez: The Legend of Zelda. Primero definimos dos conjuntos: player1 y player2, cada uno de los cuales contiene t铆tulos de videojuegos famosos de esta franquicia.
Sin embargo, es en la l铆nea 10 donde vemos el meollo del asunto: played = player1.intersection_update(player2). Lo que hace el m茅todo intersection_update es seleccionar los elementos comunes de ambos conjuntos y sobrescribir el primero con esos elementos. Entonces, si imprimimos el contenido de player1 veremos que consta de {"Majora's Mask"}, ya que es el 煤nico elemento que ambos conjuntos tienen en com煤n.
Ahora bien, no te dejes confundir por la forma en que las dos cadenas comunes estaban codificadas en el script: "Majoras's Mask" (l铆nea 3) es exactamente igual que 'Majora\'s Mask' (l铆nea 8), porque en la segunda, la barra invertida seguida de ' es una de las muchas secuencias de escape de Python y sirve para usar ese car谩cter dentro de una cadena delimitada con ese mismo car谩cter, lo que hace que la notaci贸n sea legal.
Pero 驴por qu茅 entonces played es None? Porque, contrariamente a lo que podr铆a pensar, el m茅todo intersection_update no devuelve un nuevo conjunto, sino que simplemente actualiza uno de los conjuntos existentes, por lo que ese m茅todo en realidad devuelve None. Este es un uso enga帽oso, pero no en vano, ya que es una forma de hacer expl铆cito un posible error.
Majoras's Mask, por cierto, es mi favorito de todos los juegos de Zelda que he jugado. 驴Y t煤?
Si quieres bloguear sobre contenido inform谩tico y de programaci贸n, te invito a unirte a Hive y participar en sus comunidades, tales como STEM-social, Develop Spanish, Programming & Dev y otras.
