#25218: python_2_unicode_compatible causes infinite recursion when
super().__str__() is called
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Reporter: jscn | Owner: nobody
Type: Uncategorized | Status: new
Component: Utilities | Version: 1.8
Severity: Normal | Resolution:
Keywords: | Triage Stage: Unreviewed
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 0 | UI/UX: 0
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Comment (by aaugustin):
`@python_2_unicode_compatible` changes the implementation of `__str__` and
`__unicode__` on Python 2. If you want to call the `__str__` method you
defined in the parent class, you have to call `super(B,
self).__unicode__()`.
The following works both on Python 2 and 3:
{{{
from __future__ import print_function, unicode_literals
from django.utils.six import PY3, python_2_unicode_compatible
@python_2_unicode_compatible
class A(object):
def __str__(self):
return 'a'
@python_2_unicode_compatible
class B(A):
def __str__(self):
text_method = '__str__' if PY3 else '__unicode__'
return getattr(super(B, self), text_method)() + 'b'
print(str(B()))
}}}
This version is more readable:
{{{
from __future__ import print_function, unicode_literals
from django.utils.six import PY3, python_2_unicode_compatible
@python_2_unicode_compatible
class A(object):
def text(self):
return 'a'
__str__ = text
@python_2_unicode_compatible
class B(A):
def text(self):
return super(B, self).text() + 'b'
__str__ = text
print(str(B()))
}}}
This isn't obvious but I can't see a way around it. (I'm the original
author of this decorator which was added to `six` later.)
--
Ticket URL: <https://code.djangoproject.com/ticket/25218#comment:10>
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