On 21/10/2010 10:10, Alexandr N Zamaraev wrote:
> 19.10.2010 14:35, Werner F. Bruhin wrote:
>> File "C:\dev\firebirdNewDriver\firebirdsql\fbcore.py", line 169, in
>> bytes_to_bint
>> val += b[i]<< (8 * (n - i -1))
>> TypeError: unsupported operand type(s) for<<: 'str' and 'int'
>>
>> This is the function containing line 169:
>>
>> def bytes_to_bint(b): # Read as big endian
>> val = 0
>> n = len(b)
>> for i in xrange(n):
>> val += b[i]<< (8 * (n - i -1))
>> if b[0]& 128: # First byte MSB eq 1 means negative.
>> val = ctypes.c_int(val).value
>> return val
>>
>> In 3.0 the input "b" is "bytes" where in 2.x this is now a "str".
>>
>> This type of stuff is way over my head, hopefully someone can let me
>> know how this should be changed to be correct in Py 2.x.
> val += ord(b[i])<< (8 * (n - i -1))
> Why not use module 'struct' to convert binary stream ?
>
Would this be possible?

Quickly looking at the doc the module "struct" it looks like it has the
same functionality from Py 2.5+ to Py 3.2.

Werner