On 12/04/2017 2:52 AM, Tim Graham wrote:
As documented
<https://docs.djangoproject.com/en/1.11/ref/utils/#django.utils.encoding.python_2_unicode_compatible>
you must return /text/ and not /bytes/ from |__str__()| when using
|@python_2_unicode_compatible|. That means |six.text_type(self.a)|
rather than |str(self.a)| (which returns bytes on Python 2).
Tim
Does this mean I should globally replace "str(" with "|six.text_type("
in a 2/3 codebase?|
???
Cheers
Mike
On Tuesday, April 11, 2017 at 11:18:02 AM UTC-4, Christophe Pettus wrote:
I've run into the issue described in the code below, where (as far
as I can tell) a natural use of __str__ in Python 2.7 results in a
Unicode error. I'm not quite sure how to write this code to work
properly on both Python 2 and Python 3; what am I missing?
(Note this issue happens on Python 2.7 regardless of the presence
of the @python_2_unicode_compatible decorator.)
Models:
from django.db import models
from django.utils.encoding import python_2_unicode_compatible
@python_2_unicode_compatible
class A(models.Model):
c = models.CharField(max_length=20)
def __str__(self):
return self.c
@python_2_unicode_compatible
class B(models.Model):
a = models.ForeignKey(A)
def __str__(self):
return str(self.a)
Failure example:
>>> from test.models import A, B
>>> a = A(c=u'répairer')
>>> a.save()
>>> a.id <http://a.id>
1
>>> a1 = A.objects.get(id=1)
>>> a1
<A: répairer>
>>> b = B(a_id=1)
>>> b.save()
>>> b.id <http://b.id>
1
>>> b1 = B.objects.get(id=1)
>>> b1
<B: [Bad Unicode data]>
>>> print b1
Traceback (most recent call last):
File "<console>", line 1, in <module>
File
"/Users/xof/Documents/Dev/environments/peep/lib/python2.7/site-packages/django/utils/six.py",
line 842, in <lambda>
klass.__str__ = lambda self: self.__unicode__().encode('utf-8')
UnicodeDecodeError: 'ascii' codec can't decode byte 0xc3 in
position 1: ordinal not in range(128)
--
-- Christophe Pettus
[email protected] <javascript:>
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