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详细介绍Python语言中的按位运算符

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WBOYOriginal
2016-06-06 11:28:161925browse

按位运算符是把数字看作二进制来进行计算的。Python中的按位运算法则如下:

按位与   ( bitwise and of x and y )

  &  举例: 5&3 = 1  解释: 101  11 相同位仅为个位1 ,故结果为 1

按位或   ( bitwise or of x and y )

  |  举例: 5|3 = 7  解释: 101  11 出现1的位是 1 1 1,故结果为 111

按位异或 ( bitwise exclusive or of x and y )

  ^  举例: 5^3 = 6  解释: 101  11 对位相加(不进位)是 1 1 0,故结果为 110

按位反转 (the bits of x inverted )

  ~  举例: ~5 = -6  解释: 将二进制数+1之后乘以-1,即~x = -(x+1),-(101 + 1) = -110

    按位反转仅能用在数字前面。所以写成 3+~5 可以得到结果-3,写成3~5就出错了

按位左移 ( x shifted left by n bits )

 

按位右移 ( x shifted right by n bits )

  >> 举例: 5>>2 = 1  解释:101 向右移动2位得到 1,即去掉右面的2位

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