Simple question

[Joel Goldstick]

On Apr 15, 2014 2:19 PM, "Phil Dobbin" <phildobbin at gmail.com> wrote:
>
> Hi, all.
>
> I've just started to learn Python (I'm reading Mark Lutz's 'Learning
> Python' from O'Reilly) & I'm confused as to this part:
>
> '>>> 0.1 + 0.1 + 0.1 - 0.3
> 5.55111.....'
>
It's not. Look at the end of the result. It's scientific notation for a
very small number
> Using 'import Decimal' you can get a much closer result i.e.
> 'Decimal('0.0')'
>
> What I'm wondering is why the first calculation that arrives at
> '5.55111...' is so far out?
>
> Many thanks,
>
> Cheers,
>
>   Phil...
>
> --
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>
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