无涯教程-NumPy - 左移运算符函数

numpy.left_shift()函数将数组元素的二进制向左移动指定位置，从右边追加等号0。

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.

其输出如下-

Left shift of 10 by two positions:
40

Binary representation of 10:
00001010

Binary representation of 40:
00101000

参考链接

https://www.learnfk.com/numpy/numpy-left-shift.html