id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
23494	Makemigrations fails with python3	Stefan Tatschner	nobody	"Hi,
makemigrations very often fails under python3 with the following traceback:

{{{
$ python manage.py makemigrations
Traceback (most recent call last):
  File ""manage.py"", line 10, in <module>
    execute_from_command_line(sys.argv)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/core/management/__init__.py"", line 385, in execute_from_command_line
    utility.execute()
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/core/management/__init__.py"", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/core/management/base.py"", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/core/management/base.py"", line 338, in execute
    output = self.handle(*args, **options)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/core/management/commands/makemigrations.py"", line 111, in handle
    convert_apps=app_labels or None,
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/migrations/autodetector.py"", line 40, in changes
    changes = self._detect_changes(convert_apps, graph)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/migrations/autodetector.py"", line 107, in _detect_changes
    self.old_apps = self.from_state.render(ignore_swappable=True)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/migrations/state.py"", line 67, in render
    model.render(self.apps)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/migrations/state.py"", line 311, in render
    body,
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/models/base.py"", line 171, in __new__
    new_class.add_to_class(obj_name, obj)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/models/base.py"", line 300, in add_to_class
    value.contribute_to_class(cls, name)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/models/fields/related.py"", line 1572, in contribute_to_class
    super(ForeignObject, self).contribute_to_class(cls, name, virtual_only=virtual_only)
  File ""/home/stefan/.virtualenvs/python3/lib/python3.4/site-packages/django/db/models/fields/related.py"", line 264, in contribute_to_class
    'app_label': cls._meta.app_label.lower()
TypeError: unsupported operand type(s) for %: 'bytes' and 'dict'
}}}

Using python2 instead fixes the problem. I use Django 1.7 from pip."	Bug	closed	Migrations	1.7	Normal	duplicate	python3		Unreviewed	0	0	0	0	0	0