Binary Decimals in Python

Raymond Hettinger python at rcn.com
Tue Mar 30 11:49:04 EDT 2010


On Mar 30, 8:13 am, aditya <bluemangrou... at gmail.com> wrote:
> To get the decimal representation of a binary number, I can just do
> this:
>
> int('11',2) # returns 3
>
> But decimal binary numbers throw a ValueError:
>
> int('1.1',2) # should return 1.5, throws error instead.
>
> Is this by design? It seems to me that this is not the correct
> behavior.

The int() constructor returns integers.
So, look to float() for non-integral values.
Binary representation isn't supported yet,
but we do have hex:

    >>> float.fromhex('1.8')
    1.5


Raymond




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