[issue22306] Inconsistent division by 0 behaviour in decimal module

Raymond Hettinger added the comment: > Sorry. Scratch my last comment. I see from the docs > ( https://docs.python.org/3/library/decimal.html ) >vthat the decimal module explicitly references that IBM spec. > I imagine that standard python arithmatic doesn't even attempt > to conform to this

[issue22306] Inconsistent division by 0 behaviour in decimal module

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[issue22306] Inconsistent division by 0 behaviour in decimal module

Stefan Krah added the comment: According to IEEE 754-2008 binary floats should use the same exceptions in this case. 7.2 Invalid operation ... e) division: division(0, 0) or division(∞, ∞) 7.3 Division by zero The divideByZero exception shall be signaled if and only if an exact infi

[issue22306] Inconsistent division by 0 behaviour in decimal module

Akima added the comment: Sorry. Scratch my last comment. I see from the docs ( https://docs.python.org/3/library/decimal.html ) that the decimal module explicitly references that IBM spec. I imagine that standard python arithmatic doesn't even attempt to conform to this ibm spec. -

[issue22306] Inconsistent division by 0 behaviour in decimal module

Akima added the comment: Hi skrah. Thanks for the feedback. That specification is interesting. As this IBM spec appears to be a /general/ specification for performing decimal arithmatic and not targetted specifically at Python's decimal arithmatic implementation, I would expect all of Python

[issue22306] Inconsistent division by 0 behaviour in decimal module

Stefan Krah added the comment: The behavior is according to the specification: http://speleotrove.com/decimal/decarith.html The idea behind it is that 1/0 can be reasonably defined as infinity, whereas 0/0 is undefined. You can see that if you disable the exceptions: >>> c = getcontext() >

[issue22306] Inconsistent division by 0 behaviour in decimal module

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[issue22306] Inconsistent division by 0 behaviour in decimal module

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[issue22306] Inconsistent division by 0 behaviour in decimal module

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[issue22306] Inconsistent division by 0 behaviour in decimal module

New submission from Akima: 1 / 0 (where both numbers are decimal.Decimal) produces a decimal.DivisionByZero exception as I would expect. This is useful. I can use a simple try except block to catch a potential division by zero error in my code. 0 / 0 (where both numbers are decimal.Decimal)