python的for如何獲得當前迴圈次數？

python的for如何獲得當前迴圈次數？

摘自：http://markmail.org/message/ryfven2i75kgsrsm

enumerate是python 2.3中新增的內建函數，它的英文說明為：

enumerate( iterable)

Return an enumerate object. iterable must be a sequence, an iterator,or some other object which supports iteration. The next() method ofthe iterator returned by enumerate() returns a tuple containing acount (from zero) and the corresponding value obtained from
iteratingover iterable. enumerate() is useful for obtaining an indexed series:(0, seq[0]), (1, seq[1]), (2, seq[2]), .... New in version 2.3.它特別適合用於一個for迴圈時，當我們同時需要計數和元素時可以使用這個函數。舉個簡單的例子，有一個字串數組，需要一行一行列印出來，同時每行前面加上計數，從1開始。

s = ['abc', 'This is a test', 'Hello, Python']

for i, line in enumerate(s):

print i+1, line