flush is not a keyword argument to print() on python 3.2

[zyga]

As can be seen here, Python 3.2 has a bit weaker version of print(). This breaks support for Ubuntu 12.04

zyga@ubuntu:~$ python3
Python 3.2.3 (default, Jun 18 2015, 21:46:58) 
[GCC 4.6.3] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> print("", flush=True)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: 'flush' is an invalid keyword argument for this function