Precidence of unary plus/minus relative to exponentiation

[Warnes, Gregory R]

The current operator precedence places unary plus and minus higher than
exponentiation.  This leads the counterintuitive result:

	>>> -2.0**2.0
	-4.0
	
Python's operator predicence is causing this to be interpreted as:

	>>> -(2.0**2.0)

rather than the normal mathematical precidence, which would give

	>>> (-2.0)**2.0

Is there a good reason for the Python order of precedence?

-Greg


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