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                1、Python使用空白來標識代碼塊。只要所有語句都縮進到同一層次,這些語句將被看作是同一個代碼塊的一部分。 2、代碼縮進和if語句組合起來,使python清楚地知道,條件為真有多少代碼要運行,以及條件語句不為真時,Python應該從哪個位置再次開始運行代碼.
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