RichieJu: 三月 2012

enumerate(sequence[, start=0]) )返回一个枚举对象，sequence必须是一个序列、迭代器或者具有具有迭代功能的对象。enumerate()是适用于获得索引集：(0, seq[0]), (1, seq[1]), (2, seq[2]), ....
>>> i = 0
>>> seq = ['one', 'two', 'three']
>>> for element in seq:
... seq[i] = '%d: %s' % (i, seq[i])
... i += 1
...
>>> seq
['0: one', '1: two', '2: three']
>>> seq = ['one', 'two', 'three']
>>> for i, element in enumerate(seq):
... seq[i] = '%d: %s' % (i, seq[i])
...
>>> seq
['0: one', '1: two', '2: three']
>>> def _treatment(pos, element):
... return '%d: %s' %(pos, element)
...
>>> seq = ['one', 'two', 'three']
>>> [_treatment(i, e1) for i, e1 in enumerate(seq)]
['0: one', '1: two', '2: three']

转自：http://greybeard.iteye.com/blog/1295827

RichieJu