Message 58787 - Python tracker

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Author	skip.montanaro
Recipients	christian.heimes, gvanrossum, nascheme, noam, rhettinger, skip.montanaro, tim.peters
Date	2007-12-18.23:52:12
SpamBayes Score	0.17369924
Marked as misclassified	No
Message-id	<18280.21621.127241.383744@montanaro.dyndns.org>
In-reply-to	<1198004599.56.0.506061970221.issue1580@psf.upfronthosting.co.za>

Content
Guido> ... trying to explain why two numbers both print the same but Guido> compare unequal ... This is not a Python-specific issue. The notion of limited precision was pounded into our heads in the numerical analysis class I took in college, 1980-ish. I'm pretty sure that was before both Python and IEEE-754. I'm pretty sure I programmed for that class in Fortran. Guido> ... (and God forbid anyone proposes adding fuzz to float ==). Is it possible to produce a FuzzyFloat class which is a subclass of float that people could use where they needed it? Its constructor could take a tolerance arg, or it could be initialized from a global default. I'm not suggesting that suchh a class replace float in the core, but that it might be useful to have it available in some contexts (available via PyPI, of course). I'm offline at the moment or I'd poke around before asking. Skip

Guido> ... trying to explain why two numbers both print the same but
    Guido> compare unequal ...

This is not a Python-specific issue.  The notion of limited precision was
pounded into our heads in the numerical analysis class I took in college,
1980-ish.  I'm pretty sure that was before both Python and IEEE-754.  I'm
pretty sure I programmed for that class in Fortran.

    Guido> ... (and God forbid anyone proposes adding fuzz to float ==).

Is it possible to produce a FuzzyFloat class which is a subclass of float
that people could use where they needed it?  Its constructor could take a
tolerance arg, or it could be initialized from a global default.  I'm not
suggesting that suchh a class replace float in the core, but that it might
be useful to have it available in some contexts (available via PyPI, of
course).  I'm offline at the moment or I'd poke around before asking.

Skip

History
Date	User	Action	Args
2007-12-18 23:52:13	skip.montanaro	set	spambayes_score: 0.173699 -> 0.17369924 recipients: + skip.montanaro, gvanrossum, tim.peters, nascheme, rhettinger, christian.heimes, noam
2007-12-18 23:52:12	skip.montanaro	link	issue1580 messages
2007-12-18 23:52:12	skip.montanaro	create