New submission from Bob Hunkins:
Hello,
I'm only a novice with Python, so please take it easy on me if I have
transgressed.
I am using Python 3.6.2 on a win10 64 bit machine, and entered this:
>>> a= [-1 ** x for x in range(1,10)]
>>> print(a)
[-1, -1, -1, -1, -1, -1, -1, -1, -1]
which is not correct.
however, entering this:
>>> b = [pow(-1, x) for x in range(1,10)]
>>> print(b)
[-1, 1, -1, 1, -1, 1, -1, 1, -1]
which is correct.
Any negative number entered and raised to an even power seems to not return a
positive value, but the pow(x,y) function works.
I never have reported a bug on any programming language ever, and surprisingly
I can't find a report of this (I did search, so if it's out there, I must not
understand how to use the search. Forgive me. As I said, I'm very new to Python
and I'm not a professional programmer.)
--
messages: 302529
nosy: rdhunkins
priority: normal
severity: normal
status: open
title: Negative number raised to even power is negative (-1 ** even = negative)
type: behavior
versions: Python 3.6
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Python tracker
<https://bugs.python.org/issue31519>
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