1. range xrange 的差別

1.1 range 返回列表對象.

1.2 xrange 返回xrange對象? 不需要返回列表里面的值, 節省內存.

>>> range(1,10) [1, 2, 3, 4, 5, 6, 7, 8, 9] >>> xrange(1,10) xrange(1, 10)

2. 列表推導

>>> [x*x for x in range(1,10)] [1, 4, 9, 16, 25, 36, 49, 64, 81] #占位符應用 >>> ['the %s' %d for d in range(1,10)] ['the 1', 'the 2', 'the 3', 'the 4', 'the 5', 'the 6', 'the 7', 'the 8', 'the 9'] #元組 >>> [(x,y) for x in range(3) for y in range(3)] [(0, 0), (0, 1), (0, 2), (1, 0), (1, 1), (1, 2), (2, 0), (2, 1), (2, 2)] #DICT >>> dict([(x,y) for x in range(3) for y in range(3)]) {0: 2, 1: 2, 2: 2} #Key, 讀了后面的值, 更新了..

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轉載于:https://www.cnblogs.com/YoungGu/p/5187238.html

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