Error in file locking backend with python 3

[Maberi]

File ".../lib/python3.4/site-packages/django_cron/backends/lock/file.py", line 20, in lock
f = open(lock_name, 'w+', 0)
ValueError: can't have unbuffered text I/O

For python3, should change line 20 to f = open(lock_name, 'wb+', 0) and line 37 to f.write(bytearray(str(os.getpid()), 'utf-8'))

[lindlof]

I did the same except I changed the line 37 to:
f.write(bytes(str(os.getpid()), 'UTF-8'))

Tested and works.

[maxim-kht]

Resolved in #110