[docs] [issue11726] linecache becomes specific to Python scripts in Python 3

[Thomas Kluyver]

Thomas Kluyver added the comment:

Someone on reddit ran into this, expecting that linecache can be used for an arbitrary text file:
http://www.reddit.com/r/Python/comments/2yetxc/utf8_encoding_problems/

I was quite surprised that the docs say "allows one to get any line from any file." I've always understood that linecache is specifically for Python files, and the use of tokenize.open() means that it will only work for files that are UTF-8 or have the #coding: magic comment in the first two lines.

I think the docs should at least mention this; I'm happy to work on a patch for it at some point if people agree.

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nosy: +takluyver

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<http://bugs.python.org/issue11726>
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