[issue8355] diff.py produce unified format by default

[anatoly techtonik]

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

It is not a diff replacement. Its output, as David noted, is not a diff output format and can not be reliably parsed due to issue7585 and issue7582 combination.

For being a diff replacement it will have to get rid of .py extension and gain a dozen of options. Such as --normal, -p, -w, -q, -r etc. Without these options diff.py can not be considered diff replacement. This script is more useful on its own, providing reasonable defaults for a cross-platform way of making patches for Python users.

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