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新手在coding时经常不了解一些技巧,从而代码会很长,很复杂,下面就将介绍几个新手应该知道的几个小技巧来简化代码。
1.反转字符串
>>> a = "codementor" >>> print "Reverse is",a[::-1] Reverse is rotnemedoc
2.转置矩阵
>>> mat = [[1, 2, 3], [4, 5, 6]] >>> zip(*mat) [(1, 4), (2, 5), (3, 6)]
3.将列表数据重新分别存储在单独的变量中
>>> a = [1, 2, 3] >>> x, y, z = a >>> x 1 >>> y 2 >>> z 3
4.将字符串列表合并为单独的一个新的字符串
>>> a = ["Code","mentor","Python","Developer"] >>> print " ".join(a) Code mentor Python Developer
5.一行代码swap两个变量
>>> a=7 >>> b=5 >>> b, a =a, b >>> a 5 >>> b 7
6.不用循环打印 “codecodecodecode mentormentormentormentormentor”
>>> print "code"*4+‘ ‘+"mentor"*5 codecodecodecode mentormentormentormentormentor
7.将列表中的数组列表合并为一个整体
>>> import itertools >>>a = [[1, 2], [3, 4], [5, 6]] >>> list(itertools.chain.from_iterable(a)) [1, 2, 3, 4, 5, 6]
8.讲只包含数字字符串转化为列表
>>> result = map(lambda x:int(x) ,raw_input().split()) 1 2 3 4 >>> result [1, 2, 3, 4]
参考:https://www.codementor.io/python/tutorial/python-tricks-for-beginners
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原文地址:http://www.cnblogs.com/Attenton/p/5644672.html