Redlines produces a Markdown text showing the differences between two strings/text. The changes are represented with strike-throughs and underlines, which looks similar to Microsoft Word's track changes. This method of showing changes is more familiar to lawyers and is more compact for long series of characters.

Redlines uses SequenceMatcher to find differences between words used.

Given an original string:

The quick brown fox jumps over the lazy dog.

And the string to be tested with:

The quick brown fox walks past the lazy dog.

The library gives a result of:

The quick brown fox <del>jumps over </del><ins>walks past </ins>the lazy dog.

Which is rendered like this:

The quick brown fox jumps over walks past the lazy dog.

pip install redlines

The library contains one class: Redlines, which is used to compare text.

from redlines import Redlines

test = Redlines(
    "The quick brown fox jumps over the lazy dog.",
    "The quick brown fox walks past the lazy dog.",
)
assert (
        test.output_markdown
        == "The quick brown fox <del>jumps over </del><ins>walks past </ins>the lazy dog."
)

Alternatively, you can create Redline with the text to be tested, and compare several times to see the results.

from redlines import Redlines

test = Redlines("The quick brown fox jumps over the lazy dog.")
assert (
        test.compare("The quick brown fox walks past the lazy dog.")
        == "The quick brown fox <del>jumps over </del><ins>walks past </ins>the lazy dog."
)

assert (
        test.compare("The quick brown fox jumps over the dog.")
        == "The quick brown fox jumps over the <del>lazy </del>dog."
)

• View and mark changes in legislation: PLUS Explorer
• Visualise changes after ChatGPT transforms a text: ChatGPT Prompt Engineering for Developers Lesson 6

Please feel free to post issues and comments. I work on this in my free time, so please excuse lack of activity.

• Style the way changes are presented
• Other than Markdown, have other output formats (HTML? PDF?)
• Associate changes with an author
• Show different changes by different authors or times.

If this was useful to you, please feel free to contact me!

MIT License