Python技巧(enumerate)

>>> 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']

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