left_shift
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。 从右侧追加相等数量的0。
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.
其输出如下 -
Left shift of 10 by two positions:
40
Binary representation of 10:
00001010
Binary representation of 40:
00101000
