NumPy 二进制左移运算符

numpy.left_shift（） 函数将数组元素的二进制表示中的位向左移动指定的位置。相同数量的0从右侧附加。

例如，

import numpy as np 

print 'Left shift of 10 by two positions:' 
print np.left_shift(10,2) 
print '\n'  

print 'Binary representation of 10:' 
print np.binary_repr(10, width = 8) 
print '\n'  

print 'Binary representation of 40:' 
print np.binary_repr(40, width = 8)  
# Two bits in '00001010' are shifted to left and two 0s appended from right.

它的输出如下：

Left shift of 10 by two positions:
40

Binary representation of 10:
00001010

Binary representation of 40:
00101000