How to write pbm file in Python 3?
andre.roberge at gmail.com
Sun Oct 31 05:21:38 CET 2010
On Oct 31, 1:11 am, Chris Rebert <c... at rebertia.com> wrote:
> On Sat, Oct 30, 2010 at 8:32 PM, André <andre.robe... at gmail.com> wrote:
> > I'm trying to create pbm (portable bitmap) files using Python 3 and
> > have run into a problem. The example I am using is the Python 2
> > Mandelbrot program found at
> > When I run it using Python 2 with size=100, I get a file of size 1311
> > bytes. This file contains the correct image.
> > When I run it using Python 3 with the same parameter (and replacing
> > xrange by range - the only change suggested by 2to3), I get a file of
> > size 1812 bytes; this file does not contain the right image.
> > Any help would be much appreciated.
> Have you tried changing all instances of chr(<whatever>) to
> bytes([<whatever>]) ?
Yes, I had. And I got the following traceback:
Traceback (most recent call last):
File "mandel_orig.py", line 39, in <module>
File "mandel_orig.py", line 30, in main
TypeError: must be str, not bytes
> In Python 3, chr() always returns Unicode rather than a bytestring; I
> suspect this might be the cause of your problem.
> If my suggestion fixes things, then arguably 2to3 ought to have warned
> about chr() and thus you should report this as a bug.
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