python enumerate 函數用法

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enumerate字典上是枚舉、列舉的意思。

 C語言中關鍵字enum也是enumerate的縮寫。 python中enumerate方法，返回一個enumerate類型。參數一般是可以遍曆的的東西，比如列表，字串什麼的。 python文檔中是這麼說的： enumerate(sequence, [start=0])Return an enumerate object. sequence must be a sequence, an iterator, or some other object which sup-ports iteration. The next() method of the iterator returned by enumerate() returns a tuple containinga count (from start which defaults to 0) and the corresponding value obtained from iterating over iter-able. enumerate() is useful for obtaining an indexed series: (0, seq[0]), (1, seq[1]), (2,seq[2]), ....  For example:>>> for i, season in enumerate([’Spring’, ’Summer’, ’Fall’, ’Winter’]):... print i, season0 Spring1 Summer2 Fall3 Winter 我試了一下，如果那句迴圈改成for  season  in  [’Spring’, ’Summer’, ’Fall’, ’Winter’]： 其實也是可以的，只是enumerate會返回一個有索引的東西，就是前邊的那個i，那個i從0開始，每一項加一。

python enumerate 函數用法