why is a negative shift value illegal?

[Erik Max Francis]

Chris Ryland wrote:

> Why shouldn't negative shifts just mean a shift in the opposite
> direction?
> To avoid confusion? Becuse there's only way way to do things in
> Python?

I'd say shifting with negative shift values is more confusing than just
disallowing nonsensical shifts.  Probably the reason is that Python is
implemented in C, and in C, negative shifts result in undefined
behavior.

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