On 03/07/2016 05:45 PM, Chris Angelico wrote:
> On Tue, Mar 8, 2016 at 11:22 AM, BartC <b...@freeuk.com> wrote:
>>
>> (Is a byte string the same as a byte array? Is a byte array the same as an
>> array.array? If I remove this line from my code, where 'data' has just been
>> read from a file:
>>
>> data=array.array('B',data)
>>
>> then it still works - Python 3. But not on Python 2. If I do .read on a
>> binary file I get a byte string in Python 3, but a string in Python 2. That
>> sort of mess.
>
> The default string in Py2 *is* a byte string.
There are some interesting differences I found between a Python 2 string
(composed of bytes) and a Python 3 byte string, such as what you'd get
from calling read() on a file handle opened in binary mode. That is in
Python 2, indexing a string returns a string of length 1. In Python
3.5, indexing a byte string returns a value, the equivalent of calling
ord() on the single byte string. This makes it a bit difficult to make
the code easily work between Python 2 and 3 and handle bytes. Any ideas
there?
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