[issue2057] difflib: add patch capability

[anatoly techtonik]

anatoly techtonik <techtonik at gmail.com> added the comment:

Unified diffs is the preferred type on this tracker as http://www.python.org/dev/patches/ describes. I also sure that they constitute more than 90% of patches attached here. If you have access to tracker attachments - you can test this.

Unfortunately, diff.py generates context diffs by default, and I do not have plans to add this format into my patch.py tool, so it won't be a correct counterpart to include in Scripts/

By ' diff/patch lib is not.' I meant that 'diff/patch _lib_ is not ready'. You can use patch.py as a tool, but don't rely that API is stable.

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