Floating point (in)accuracy?
Grant Edwards
grante at visi.com
Wed Apr 25 14:31:14 EDT 2001
In article <9c6vmq02kec at news2.newsguy.com>, Alex Martelli wrote:
>> Apparently the python mailiing lists on python.org are blocked, so let
>> me ask here. Is there any good reason for the following behaviour to
>> be different on Python 1.5.2 and 2.0?
> [snip]
>> >>> 3.14
>> 3.14
> [snip]
>> >>> 3.14
>> 3.1400000000000001
>
>Yes: repr(x) where x is a float used to HIDE some digits
>(trying to provide a 'prettier' look), but that violates the
>mission of repr, which is to give you as much info as it can.
I presume that on typical platforms, it can't be guaranteed
that float(repr(x)) == x.
If you pickle a float and then un-pickle it on the same
platform are you guaranted to end up with the same binary
representation?
--
Grant Edwards grante Yow! People humiliating
at a salami!
visi.com
More information about the Python-list
mailing list