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                ## 元組賦值 元組賦值是另一種形式的賦值語句,它允許同時更新多個變量的值。在賦值之前,賦值語句右邊的所有表達式將會先進行求值,然后再統一更新左邊對應變量的值。這對于處理有些同時出現在元組賦值語句左右兩邊的變量很有幫助,例如我們可以這樣交換兩個變量的值: ~~~ x, y = y, x a[i], a[j] = a[j], a[i] ~~~ ## 可賦值性 不管是隱式還是顯式地賦值,在賦值語句左邊的變量和右邊最終的求到的值必須有相同的數據類型。更直白地說,只有右邊的值對于左邊的變量是可賦值的,賦值語句才是允許的。
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