[Tutor] The '45' bug in round()

[andrew clarke]

On Mon, Mar 19, 2007 at 03:04:03AM -0700, Dick Moores wrote:

> Yesterday I was shocked, SHOCKED, to discover that round() is 
> occasionally rounding incorrectly. For example,

"Garbage In, Garbage Out" :-)

Floating point numbers in Python (and other computer languages) are only
an approximation:

>>> print round(0.145, 2)
0.14
>>> 0.145
0.14499999999999999
>>> print round(0.1450000001, 2)
0.15

http://docs.python.org/tut/node16.html has some more information about
this.