[issue7224] One obvious way to do interning

[Nick Coghlan]

Nick Coghlan <ncoghlan at gmail.com> added the comment:

If the idea is to create the "one obvious way" for interning, calling
the method and corresponding C function "intern" isn't painting a
bikeshed, it's meeting the design spec :)

Adding a new method also avoids a whole host of issues with the Set ABC.

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nosy: +ncoghlan

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<http://bugs.python.org/issue7224>
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