python函数巧用之---enumerate

使用enumerate函数

普通的遍历（打印出 索引+值）

In [5]: seq = ["one", "two", "three"]

In [6]: i = 0

In [7]: for ele in seq:
   ...:     seq[i] = '%d: %s' % (i, seq[i])
   ...:     i += 1
   ...:     

In [8]: print seq
['0: one', '1: two', '2: three']

使用enumerate后

In [9]: seq = ["one", "two", "three"]

In [10]: for i, ele in enumerate(seq):
    ...:     seq[i] = '%d: %s' % (i, seq[i])
    ...:     

In [11]: print seq
['0: one', '1: two', '2: three']

更加pythonic的写法

In [12]: seq = ["one", "two", "three"]

In [13]: print ['%d: %s' % (i, ele) for i, ele in enumerate(seq)] 
['0: one', '1: two', '2: three']

哈，函数使得代码更加整洁了呢！（参照网上示例。）