[denis@fedora ~]$ uname -a
Linux fedora 3.10.0-229.1.2.el7.x86_64 #1 SMP Fri Mar 27 03:04:26 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[denis@fedora ~]$ python3
Python 3.4.3 (default, Apr  7 2015, 10:10:26) 
[GCC 4.8.3 20140911 (Red Hat 4.8.3-9)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
[denis@fedora ~]$ python
  File "/usr/local/lib/python3.4/site.py", line 176
    file=sys.stderr)
        ^
SyntaxError: invalid syntax

[denis@fedora ~]$ python2
  File "/usr/local/lib/python3.4/site.py", line 176
    file=sys.stderr)
        ^
SyntaxError: invalid syntax
[denis@fedora ~]$ python -V
Python 2.7.9
[denis@fedora ~]$ python2.7
  File "/usr/local/lib/python3.4/site.py", line 176
    file=sys.stderr)
        ^
SyntaxError: invalid syntax