NumPy - 左移

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  简述

  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位置。从右侧附加相同数量的 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.
  

  它的输出如下 -

  
  Left shift of 10 by two positions:
  40
  Binary representation of 10:
  00001010
  Binary representation of 40:
  00101000