How to get an integer from a sequence of bytes
Ned Batchelder
ned at nedbatchelder.com
Thu May 30 15:22:26 EDT 2013
On 5/30/2013 2:26 PM, Mok-Kong Shen wrote:
> Am 27.05.2013 17:30, schrieb Ned Batchelder:
>> On 5/27/2013 10:45 AM, Mok-Kong Shen wrote:
>>> From an int one can use to_bytes to get its individual bytes,
>>> but how can one reconstruct the int from the sequence of bytes?
>>>
>> The next thing in the docs after int.to_bytes is int.from_bytes:
>> http://docs.python.org/3.3/library/stdtypes.html#int.from_bytes
>
> I am sorry to have overlooked that. But one thing I yet wonder is why
> there is no direct possibilty of converting a byte to an int in [0,255],
> i.e. with a constrct int(b), where b is a byte.
>
Presumably you want this to work:
>>> int(b'\x03')
3
But you also want this to work:
>>> int(b'7')
7
These two interpretations are incompatible. If b'\x03' becomes 3, then
shouldn't b'\x37' become 55? But b'\x37' is b'7', and you want that to
be 7.
--Ned.
> M. K. Shen
>
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