1.090516455488E9 / 1000000.000 ???

[Nick Craig-Wood]

Math <mathweijzen at home.nl> wrote:
>  I got a simple and probably stupid newby question..
>  When I compute: 
>  1.090516455488E9 / 1000000
>  the result is 1090516455.49
>  Should be 1090516455.488
> 
>  I know something with float and //...

http://www.python.org/doc/faq/general/#why-are-floating-point-calculations-so-inaccurate

Eg

>>> a=1.090516455488E9 / 1000000
>>> print a
1090.51645549
>>> print repr(a)
1090.516455488
>>> 

If you want a given number of decimal places you can use a formatter,
eg

>>> print "%.20f" % a
1090.51645548800001961354

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick