Jorgen Grahn schrieb:
On Sun, 03 Aug 2008 16:50:22 +0200, Diez B. Roggisch <[EMAIL PROTECTED]> wrote:
CNiall schrieb:
...
>>> 0.2
0.20000000000000001
...
Welcome to the wonderful world of IEEE754. Just because other languages
shield you from the gory details they still are there. Python chose to
not do that, instead showing the rounding errors introduced and making
the developer decide how to deal with these.
Which other languages try to hide how floating-point numbers behave?
PHP and Java, amongst others. The implicitly apply a formatting when
producing a string-representation.
The correct way of dealing with this (you probably agree) is never to
expect infinite precision from floats, and design your code/algorithms
accordingly -- never use "if f1==f2:" and so on.
Floating-point is a tricky area. Lots of programmers (including me)
know too little about it.
It sure is and I don't know too much myself. But IMHO python does
something right when making the programmer aware of the problems that
can appear.
Diez
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