daemonize.py: unbuffered text IO error (python3)

[alex01@…]

When trying to run fcgi server I get "ValueError: can't have unbuffered text I/O"

My python version and django version:

$ python --version
Python 3.2.3

django.get_version()

'1.7.dev20130726184538'

Can't start server:
(virtenv02)jsmith@thinkpad01:~/virtenv02/mysite$ python manage.py runfcgi host=127.0.0.1 port=8100
Traceback (most recent call last):

File "manage.py", line 10, in <module>

execute_from_command_line(sys.argv)

File "/home/jsmith/virtenv02/django-trunk/django/core/management/init.py", line 397, in execute_from_command_line

utility.execute()

File "/home/jsmith/virtenv02/django-trunk/django/core/management/init.py", line 390, in execute

self.fetch_command(subcommand).run_from_argv(self.argv)

File "/home/jsmith/virtenv02/django-trunk/django/core/management/base.py", line 240, in run_from_argv

self.execute(*args, options.dict)

File "/home/jsmith/virtenv02/django-trunk/django/core/management/base.py", line 283, in execute

output = self.handle(*args, options)

File "/home/jsmith/virtenv02/django-trunk/django/core/management/commands/runfcgi.py", line 22, in handle

runfastcgi(args)

File "/home/jsmith/virtenv02/django-trunk/django/core/servers/fastcgi.py", line 176, in runfastcgi

become_daemon(our_home_dir=optionsworkdir, daemon_kwargs)

File "/home/jsmith/virtenv02/django-trunk/django/utils/daemonize.py", line 28, in become_daemon

so = open(out_log, 'a+', 0)

ValueError: can't have unbuffered text I/O

Server starts successfully and works if I give it daemonize=False option:
(virtenv02)jsmith@thinkpad01:~/virtenv02/mysite$ python manage.py runfcgi host=127.0.0.1 port=8100 daemonize=False

As far as I understand, this issue is specific to python3 and is related to changes in open function introduced in pep-3116

Alex