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Author Tim.Graham
Recipients Martin.Teichmann, Tim.Graham, eric.snow, gvanrossum, ncoghlan, ned.deily, python-dev
Date 2016-12-02.14:34:51
SpamBayes Score -1.0
Marked as misclassified Yes
Message-id <>
Hi, this causes a regression in Django and I'm not sure if Django or cpython is at fault. For a simple model that uses super() rather than super(Model self) in save():

from django.db import models

class Model(models.Model):
    def save(self, *args, **kwargs):
        super().save(*args, **kwargs)

>>> Model().save()
Traceback (most recent call last):
  File "/home/tim/code/mysite/model/", line 8, in test
  File "/home/tim/code/mysite/model/", line 5, in save
    super().save(*args, **kwargs)
RuntimeError: super(): empty __class__ cell

django.db.models.Model does some things with metaclasses which is likely related to the root cause:

If someone could provide guidance about what the issue might be, I'm happy to provide more details or to debug this further.

Thank you!
Date User Action Args
2016-12-02 14:34:52Tim.Grahamsetrecipients: + Tim.Graham, gvanrossum, ncoghlan, ned.deily, python-dev, eric.snow, Martin.Teichmann
2016-12-02 14:34:52Tim.Grahamsetmessageid: <>
2016-12-02 14:34:52Tim.Grahamlinkissue23722 messages
2016-12-02 14:34:51Tim.Grahamcreate