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Fast delta encoding using xdelta3

Project description

BuildStatus Coverage pypi

Fast delta encoding in python using xdelta3.


  • Python 3.6
  • linux


import xdelta3
value_one = b'this is a wonderful string to demonstrate with. Much of the two strings is duplicated.'
value_two = b'this is a different string to demonstrate with. Much of the two strings is duplicated.'
delta = xdelta3.encode(value_one, value_two)

print(f'New string length: {len(value_two)}, delta length: {len(delta)}')
value_two_rebuilt = xdelta3.decode(value_one, delta)
if value_two_rebuilt == value_two:
    print('Boo Ya! Delta encoding successful.')

How fast?

xdelta3-python is a thing wrapper around xdelta 3.1.1 which is a highly optimised c library for delta encoding calculation and compression.

It can encode a delta and decode it again for 5 small changes in a 5.4M character string (the complete works of shakespeare) in around 30ms. Boom. See

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Files for xdelta3, version 0.0.1
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