Migration failure in 1.7c1 on DateTimeField defaults

I have created two new fields on my model. Created and updated. They are both DateTimeField objects. When I run makemigrations it asks for a fix because there is no default value for the two fields. I have tried datetime.now(), datetime.datetime.now(), datetime.date.today(), etc. However, I keep getting the same error so I can't update my tables. Here is the error I am getting:

You are trying to add a non-nullable field 'created' to chore without a default;
we can not do that (the database needs something to populate existing rows).
Please select a fix:
 1) Provide a one-off default now (will be set on all existing rows)
 2) Quit, and let me add a default in models.py
Select an option: 1
Please enter the default value now, as valid Python
The datetime module is available, so you can do e.g. datetime.date.today()
>>> datetime.datetime.now
Traceback (most recent call last):
  File "/Applications/PyCharm.app/helpers/pycharm/django_manage.py", line 23, in <module>
    run_module(manage_file, None, '__main__', True)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 176, in run_module
    fname, loader, pkg_name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 82, in _run_module_code
    mod_name, mod_fname, mod_loader, pkg_name)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "...manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
  File "...lib/python2.7/site-packages/django/core/management/__init__.py", line 385, in execute_from_command_line
    utility.execute()
  File "...lib/python2.7/site-packages/django/core/management/__init__.py", line 377, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "...lib/python2.7/site-packages/django/core/management/base.py", line 288, in run_from_argv
    self.execute(*args, **options.__dict__)
  File "...lib/python2.7/site-packages/django/core/management/base.py", line 337, in execute
    output = self.handle(*args, **options)
  File "...lib/python2.7/site-packages/django/core/management/commands/makemigrations.py", line 111, in handle
    convert_apps=app_labels or None,
  File "...lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 50, in changes
    changes = self._detect_changes(convert_apps, graph)
  File "...lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 180, in _detect_changes
    self.generate_added_fields()
  File "...lib/python2.7/site-packages/django/db/migrations/autodetector.py", line 720, in generate_added_fields
    field.default = self.questioner.ask_not_null_addition(field_name, model_name)
  File "...lib/python2.7/site-packages/django/db/migrations/questioner.py", line 119, in ask_not_null_addition
    code = input(">>> ").decode(sys.stdin.encoding)
TypeError: decode() argument 1 must be string, not None

Any ideas how to make this work?

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