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).
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
> 1
> >>> a1 = A.objects.get(id=1)
> >>> a1
> <A: répairer>
> >>> b = B(a_id=1)
> >>> b.save()
> >>> 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
> x...@thebuild.com <javascript:>
>
>
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