[issue2142] difflib.unified_diff(...) produces invalid patches

[Ray.Allen]

Ray.Allen <ysj.ray at gmail.com> added the comment:

Yes there may be.

Here is the updated patch:

Add a new keyword argument to context_diff() and unified_diff() named "warn_no_newline_at_end". If true, emit "\ No newline etc". It defaults to True, set it to false to get the old behavior. I'm not sure if this name is too long, but I haven't got a better name.

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Added file: http://bugs.python.org/file21207/issue_2142_2.diff

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