#25218: python_2_unicode_compatible causes infinite recursion when
super().__str__() is called
-------------------------------+--------------------------------------
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 charettes):
I reproduce with the correct `super()` call on Python 2.7:
{{{#!python
In [1]: from django.utils.six import python_2_unicode_compatible
In [2]: @python_2_unicode_compatible
class A(object):
def __str__(self):
return str('a')
...:
In [3]: str(A())
Out[3]: 'a'
In [4]: unicode(A())
Out[4]: u'a'
In [5]: class B(A):
def __str__(self):
return str('b') + super(B, self).__str__()
...:
In [6]: str(B())
Out[6]: 'ba'
In [7]: unicode(B()) # Notice how B.__str__() isn't called.
Out[7]: u'a'
In [8]: @python_2_unicode_compatible
class C(A):
def __str__(self):
return str('c') + super(C, self).__str__()
...:
In [9]: str(C())
--------------------------------------------------------------------------
...
<ipython-input-8-efd21456ef94> in __str__(self)
2 class C(A):
3 def __str__(self):
----> 4 return str('c') + super(C, self).__str__()
5
django/django/utils/six.pyc in <lambda>(self)
810 klass.__name__)
811 klass.__unicode__ = klass.__str__
--> 812 klass.__str__ = lambda self:
self.__unicode__().encode('utf-8')
813 return klass
814
RuntimeError: maximum recursion depth exceeded in __subclasscheck__
In [10]: unicode(C())
--------------------------------------------------------------------------
...
<ipython-input-8-efd21456ef94> in __str__(self)
2 class C(A):
3 def __str__(self):
----> 4 return str('c') + super(C, self).__str__()
5
django/django/utils/six.pyc in <lambda>(self)
810 klass.__name__)
811 klass.__unicode__ = klass.__str__
--> 812 klass.__str__ = lambda self:
self.__unicode__().encode('utf-8')
813 return klass
814
RuntimeError: maximum recursion depth exceeded in __subclasscheck__
}}}
--
Ticket URL: <https://code.djangoproject.com/ticket/25218#comment:8>
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