Antoine Pitrou added the comment:

> When the char* type is used, the function has usually the suffix
> String. I prefer the PyIdentifier API because it avoids to create a
> temporary Python Unicode object.

This is a convenience API, not a performance "optimization".

> It's the first type that I see a function getting an attribute which
> also checks for its type. I don't know if the check should be done
> in PyState_GetModuleAttr() or in the _csv module.

The aim is to help writing extension modules, which is why the type
check is done inside the helper function.

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<http://bugs.python.org/issue18710>
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