Problem with psycopg2, bytea, and memoryview

Antoine Pitrou solipsis at pitrou.net
Wed Jul 31 15:07:33 CEST 2013


Frank Millman <frank <at> chagford.com> writes:
> 
> Thanks for that, Antoine. It is an improvement over tobytes(), but i am 
> afraid it is still not ideal for my purposes.

I would suggest asking the psycopg2 project why they made this choice, and
if they would reconsider. Returning a memoryview doesn't make much sense IMHO.

For example, the standard sqlite3 module returns bytes for BLOB columns,
and str for TEXT columns:
http://docs.python.org/3.4/library/sqlite3.html#introduction

> Can anyone explain *why* the results do not compare equal? If I understood 
> the problem, I might be able to find a workaround.

Well, under recent Python versions, they should compare equal:

Python 3.2.3 (default, Oct 19 2012, 19:53:16) 
[GCC 4.7.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> memoryview(b"abc") == b"abc"
True


Regards

Antoine.





More information about the Python-list mailing list