[Tutor] index elongated/decreased

[Tim Peters]

[Thomas Rivas]
> Hi progressing  pythonistas--

Hi!

> Playing with the interpreter I came up with this:
>
> >>> a = [66.6, 333, 333, 1, 1234.5]
> >>> print a.count(333), a.count(66.6), a.count('y')
> 2 1 0
> >>> a.insert(2, -1)
> >>> a.append(333)
> >>> a
> [66.599999999999994, 333, -1, 333, 1, 1234.5, 333]
>
> Can anyone explain why 0th index came out as it did? Is this a 
> floating point arithmetic issue/limitation? Thanks.

Indeed it is.  A full explantion is here:

    <http://www.python.org/doc/current/tut/node14.html>

Note that you can demonstrate the effect with less effort <wink>:

>>> 66.6
66.599999999999994
>>>