[?!ng] > ... > I'd bet that no one really relies on or expects the uppercase > forms except L. And 0X. I don't think it's in the std library, but I've certainly seen Python code do stuff like magic = 0XFEEDFACE Plus it's always good for a language to be able parse the stuff it prints, and "0X..." is generated by Python's %#X format code. Don't believe I've ever seen the "u" or "r" string modifiers in uppercase, though, but really don't see the harm in allowing that.
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