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> I don't like it because it adds a cumbersome code for guarding against a case that doesn't happen in practice.
Hum, sorry, I don't understand what is the issue with adding a few addition checks in the constructor? Is it a matter of speed?
> This is just unpythonic.
Wait, what? I asked you to add checks to not break the Python semantics. If you want to be "Pythonic": you must support the Python semantics, so support when __getitem__, __len__, etc. are replaced.
I don't understand your "unpythonic" argument.
> _sre.compile() is a private function and it is called only with exact types.
Right. So what is the problem with adding more sanity checks?
> Even if it would called with subtypes, most subtypes don't override __len__ and __getitem__. This restriction is too strong.
It's a matter of respecting the Python semantics.