Python : Using abc in Python < 2.6

Do someone know an implementation of abc for older versions of Python (older than 2.6) ?

EDIT : I am for example looking for a snippet that would do the same thing as ABCMeta and abstr开发者_如何学JAVAactmethod, with same interface, I actually need to make a piece of code backward compatible

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The abc module itself happens to be backwards compatible. Just copy abc.py from 2.6 to somewhere on the pythonpath.

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There is nothing like that. But metaclasses are a core concept of Python since a long time.