unexpected decimal.InvalidOperation - Printable Version +- Python Forum (https://python-forum.io) +-- Forum: General (https://python-forum.io/forum-1.html) +--- Forum: News and Discussions (https://python-forum.io/forum-31.html) +--- Thread: unexpected decimal.InvalidOperation (/thread-35870.html) |
unexpected decimal.InvalidOperation - Skaperen - Dec-25-2021 when doing decimal.Decimal('-inf')+decimal.Decimal('+inf') i got decimal.InvalidOperation raised. i was expecting to get Decimal('0' ). there are a few operations on infinity that normal arithmetic allows such as inf-inf -> 0 and 0*inf -> 0 both of which the decimal.Decimal class does not allow. is there a reason for this or is it just up to whoever implemented decimal.Decimal ?
RE: unexpected decimal.InvalidOperation - casevh - Dec-25-2021 The behavior you are seeing is part of IEEE-754 standard. The easiest chart I found is in the "Special Operations" section of https://steve.hollasch.net/cgindex/coding/ieeefloat.html. The specification that defines the decimal library is available at:http://speleotrove.com/decimal/decarith.html The behavior is documented in section 7 Exceptional Conditions. RE: unexpected decimal.InvalidOperation - Skaperen - Dec-25-2021 thanks for the info. i'll leave my opinions for another place and time. |