[docs] [issue19054] Descriptors howto

[Raymond Hettinger]

Raymond Hettinger added the comment:

The indentation is not incorrect.  What you're seeing is normal for the interactive prompt.

Also, it is not incorrect to inherit from object in Python 3.
There is some value in keeping the document the same between versions.

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resolution:  -> invalid
status: open -> closed

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<http://bugs.python.org/issue19054>
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