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Created on 2004-09-10 13:53 by ncoghlan, last changed 2022-04-11 14:56 by admin. This issue is now closed.
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| msg22423 - (view) | Author: Nick Coghlan (ncoghlan) *  |
Date: 2004-09-10 13:53 | |
According to Python 2.3 and 2.4, -1 ** 0 = -1 ! It appears to do this for any negative value. The answer to x ** 0 should be 1, regardless of the sign of x. |
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| msg22424 - (view) | Author: Nick Coghlan (ncoghlan) * |
Date: 2004-09-10 14:00 | |
Logged In: YES user_id=1038590 The plot thickens. . . if I use the operator module, it works: Python 2.3.4 (#1, Jun 15 2004, 21:38:43) [GCC 3.4.0 20040613 (Red Hat Linux 3.4.0-5)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> -4.3 ** 0 -1.0 >>> from operator import __pow__ >>> __pow__(-1, 0) 1 >>> -1 ** 0 -1 >>> |
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| msg22425 - (view) | Author: Tim Peters (tim.peters) * |
Date: 2004-09-10 14:07 | |
Logged In: YES user_id=31435 Precedence. From the language ref: "The power operator binds more tightly than unary operators on its left; it binds less tightly than unary operators on its right.". Python doesn't have negative numeric literals. -1 is the unary minus operator applied to the positive literal 1. So -1**0 parses as -(1**0) and -1 is the correct result. Add parens if you want a different evaluation order: >>> (-1)**0 1 >>> |
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| History | |||
|---|---|---|---|
| Date | User | Action | Args |
| 2022-04-11 14:56:06 | admin | set | github: 40897 |
| 2004-09-10 13:53:24 | ncoghlan | create | |