Learning Numpy - Simple Tutorial For Beginners - NumPy Byte Swapping Part 18

numpy.ndarray.byteswap()

The numpy.ndarray.byteswap() function

Swap the bytes of the array elements

Toggle between low-endian and big-endian data representation by returning a byteswapped array, optionally swapped in-place. Arrays of byte-strings are not swapped. The real and imaginary parts of a complex number are swapped individually.

Parameters inplacebool, optional

If True, swap bytes in-place, default is False.

Returns

outndarray
The byteswapped array. If inplace is True, this is a view to self.

import numpy as np
a = np.array([1, 256, 8755], dtype = np.int16)

print ('Our array is:')
print (a)
print ('\n')

print ('Representation of data in memory in hexadecimal form:')
print (map(hex,a))
print ('\n')
# byteswap() function swaps in place by passing True parameter 

print ('Applying byteswap() function:')
print (a.byteswap(True))
print ('\n')

print ('In hexadecimal form:')
print (list (map(hex,a)) )
print ('\n')
# We can see the bytes being swapped

Our array is:
[   1  256 8755]


Representation of data in memory in hexadecimal form:
<map object at 0x7fd33c37a358>


Applying byteswap() function:
[  256     1 13090]


In hexadecimal form:
['0x100', '0x1', '0x3322']

Refernces

• Learning Numpy - Array From Existing Data Part 6
• Learning Numpy - Array Creation Routines Part 5
• Learning Numpy - Array Attributes Part 4
• Learning Numpy - Data Types Part 3