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
24651	makemigrations: AttributeError: 'bytes' object has no attribute 'pattern' (Django 1.8/Python 3.4)	Luis Diego García	nobody	"I added two DateTimeFields to my model and wanted to run makemigrations.

Got this error:

{{{
Traceback (most recent call last):
  File ""./manage.py"", line 11, in <module>
    execute_from_command_line(sys.argv)
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/core/management/__init__.py"", line 338, in execute_from_command_line
    utility.execute()
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/core/management/__init__.py"", line 330, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/core/management/base.py"", line 390, in run_from_argv
    self.execute(*args, **cmd_options)
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/core/management/base.py"", line 441, in execute
    output = self.handle(*args, **options)
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/core/management/commands/makemigrations.py"", line 125, in handle
    migration_name=self.migration_name,
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/db/migrations/autodetector.py"", line 43, in changes
    changes = self._detect_changes(convert_apps, graph)
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/db/migrations/autodetector.py"", line 186, in _detect_changes
    self.generate_altered_fields()
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/db/migrations/autodetector.py"", line 850, in generate_altered_fields
    if old_field_dec != new_field_dec:
  File ""/home/areca/venv/lf2/lib/python3.4/site-packages/django/core/validators.py"", line 55, in __eq__
    self.regex.pattern == other.regex.pattern and
AttributeError: 'bytes' object has no attribute 'pattern'
}}}

Switched to a Python 2.7 environment and the error doesn't happen."	Bug	closed	Migrations	1.8	Normal	duplicate		scailer@…	Unreviewed	0	0	0	0	0	0