[Tutor] Bitwise operation

[David Hutto]

On Mon, Feb 28, 2011 at 4:43 AM, Martin A. Brown <martin at linux-ip.net> wrote:
>
>  : i'm confused with & and AND. for eg:
>  : >>> 1110 & 0110
>  : 64
>  : >>> 1110 and 0110
>  : 72
>  :
>  : i'm expecting if 1110 and with 0110 will get 0110 or 6.
>  : pls advise.
>
> Above, python thinks you are representing one number in decimal
> notation and the other in octal.
>
> Decimal (no leading zeroes):
>>>> 14 & 6
> 6
>
> Binary (leading with '0b'):
>>>> 0b1110 & 0b0110
> 6
>
> Octal (leading with '0'):
>>>> 016 & 006
> 6
>
> Hexadecimal (leading with '0x'):
>>>> 0xe & 0x06
> 6
>
> Additionally, you will want to distinguish which operator you
> intend, bitwise or boolean.  It seems fairly clear that you are
> intending the bitwise operator if you are expecting '6' to be the
> answer.
>
>  &       bitwise 'and'
>  and     boolean 'and'
>
> Read these three sections, at least, to understand the
> operators you are trying to use:
>
>  http://docs.python.org/reference/expressions.html#unary-arithmetic-and-bitwise-operations
>  http://docs.python.org/reference/expressions.html#boolean-operations
>  http://docs.python.org/reference/expressions.html#summary
>
> This may also be useful:
>
>  http://docs.python.org/library/stdtypes.html#numeric-types-int-float-long-complex
>
> Good luck,
And skill/memory/reference.

>
> -Martin
>
> --
> Martin A. Brown
> http://linux-ip.net/
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