[docs] [issue9196] Improve docs for string interpolation "%s" re Unicode strings

[Craig McQueen]

Craig McQueen <python at craig.mcqueen.id.au> added the comment:

I should be able to attach my test code. But it is at my work, and I'm on holidays for 2 more weeks. Sorry 'bout that!

I do assume that Python 3 greatly simplifies this.

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