newb: Python Floating Point

[johnny]

When I do the following, rounding to 2 decimal places doesn't seem to
work. I should get 0.99 :

>>a =0.99
>>a

0.9899999999999 9999

>>round(a,2)

0.9899999999999 9999

>>>

thank you.

[Robert Kern]

Re: newb: Python Floating Point

johnny wrote:

When I do the following, rounding to 2 decimal places doesn't seem to
work. I should get 0.99 :
>

>>>a =0.99
>>>a

0.9899999999999 9999

>>>round(a,2)

0.9899999999999 9999

http://docs.python.org/tut/node16.html

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco

[Dan Bishop]

Re: newb: Python Floating Point

On Mar 15, 6:09 pm, "johnny" <rampet...@gmai l.comwrote:

When I do the following, rounding to 2 decimal places doesn't seem to
work. I should get 0.99 :

In binary, 0.99 is the recurring fraction 0.11 111101011100001 01000
111101011100001 01000 111101011100001 01000 .... Thus, it can't be
exactly represented as a float.