bltinmodule.c (original) (raw)

Guido van Rossum guido at python.org
Fri Jun 27 21:04:34 CEST 2008

PS. I can't get excited about having support for this in %-style format strings (and even less so now %a already means "call ascii()"). It would be easy enough to add support for it to float.format() though.

On Fri, Jun 27, 2008 at 12:02 PM, Guido van Rossum <guido at python.org> wrote:

Now that I've learned about the hex float format supported by C++ and Java, I wonder if it wouldn't be better to support conversion to and from that format and nothing else.

E.g.

math.tohex(3.14) '0x1.91eb851eb851fp+1' math.fromhex('0x1.91eb851eb851fp+1') 3.1400000000000001

BTW I am still hoping to be able the output of the second command to just "3.14" but the tracker issue for that (http://bugs.python.org/issue1580) is stuck on trying to decide whether it's okay to have repr() occasionally return a string that doesn't convert to the exact same value on another platform. (My preferred approach would ensure that it does convert to the same value on the same platform, because that's how I'd compute it.) Perhaps the existance of an unambiguous hex format that is also interchangeable with Java and C (and presumably C++) would alleviate that concern. -- --Guido van Rossum (home page: http://www.python.org/~guido/)

-- --Guido van Rossum (home page: http://www.python.org/~guido/)

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