[docs] [issue11479] Add discussion of trailing slash in raw string to tutorial

[Eli Bendersky]

Eli Bendersky <eliben at gmail.com> added the comment:

Would it not be better to just recommend Windows users not to put that last backslash in at all? IIUC it's only needed to later append file names to directory names, but that's better achieved with os.path.join

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nosy: +eli.bendersky

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11479>
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