  # numpy.left_shift () in Python

NumPy | Python Methods and Functions

Bits are shifted left by adding arr2 0s (zeros) to the right of arr1. Since numbers are internally represented in binary, this operation is equivalent to multiplying arr1 by 2 ** arr2. For example, if the number is 5 and we want to shift left by 2 bits, then after shifting 2 bits to the left, the result will be 5 * (2 ^ 2) = 20

Syntax: numpy.left_shift (arr1, arr2, /, out = None, *, where = True, casting = `same_kind`, order = `K`, dtype = None, ufunc `left_shift`)

Parameters:
arr1: array_like of integer type
arr2: array_like of integer type
Number of zeros to append to arr1.The value of arr2 should be positive integer.

out: [ndarray, optional] A location into which the result is stored.
- & gt ; If provided, it must have a shape that the inputs broadcast to.
- & gt; If not provided or None, a freshly-allocated array is returned.

** kwargs: allows you to pass keyword variable length of argument to a function. It is used when we want to handle named argument in a function.

where: [array_like, optional] True value means to calculate the universal functions (ufunc) at that position, False value means to leave the value in the output alone.

Return: array of integer type.
Return arr1 with bits shifted arr2 times to the left. This is a scalar if both arr1 and arr2 are scalars.

Code # 1: Work

` `

` # Python program explaining # left_shift () function    import numpy as geek in_num = 5 bit_shift = 2   print ( "Input number:" , in_num) print ( "Number of bit shift:" , bit_shift)    out_num = geek.left_shift (in_num, bit_shift)  print ( "After left shifting 2 bit :" , out_num) `

Output:

` Input number: 5 Number of bit shift: 2 After left shifting 2 bit: 20 `

Code # 2:

` `

` # Python program explaining # left_shift () function   import numpy as geek   in_arr = [ 2 , 8 , 15 ] bit_shift = [ 3 , 4 , 5 ]   print ( " Input array: " , in_arr)  print ( "Number of bit shift:" , bit_shift)   out_arr =  geek.left_shift (in_arr, bit_shift)  print ( " Output array after left shifting: " , out_arr)  `

Output:

` Input array: [2, 8, 15] Number of bit shift: [3, 4, 5] Output array after left shifting: [16 128 480] `