When Installing Bench got this error please help

[~]# bench init frappe-bench && cd frappe-bench
Traceback (most recent call last):
File “/usr/bin/bench”, line 5, in
from pkg_resources import load_entry_point
File “/usr/lib/python2.6/site-packages/setuptools-0.9.8-py2.6.egg/pkg_resource s.py”, line 3007, in

File “/usr/lib/python2.6/site-packages/setuptools-0.9.8-py2.6.egg/pkg_resource s.py”, line 728, in require
if search_path is None:
File “/usr/lib/python2.6/site-packages/setuptools-0.9.8-py2.6.egg/pkg_resource s.py”, line 626, in resolve
# success, no need to try any more versions of this project
pkg_resources.DistributionNotFound: bench==4.1.0
hroms@hroms.net [~]# bench init frappe-bench
Traceback (most recent call last):
File “/usr/bin/bench”, line 5, in
from pkg_resources import load_entry_point
File “/usr/lib/python2.6/site-packages/setuptools-0.9.8-py2.6.egg/pkg_resource s.py”, line 3007, in

File “/usr/lib/python2.6/site-packages/setuptools-0.9.8-py2.6.egg/pkg_resource s.py”, line 728, in require
if search_path is None:
File “/usr/lib/python2.6/site-packages/setuptools-0.9.8-py2.6.egg/pkg_resource s.py”, line 626, in resolve
# success, no need to try any more versions of this project
pkg_resources.DistributionNotFound: bench==4.1.0

which version of python are you using? Bench requires python 2.7

actually both 2.6 and 2.7 are installed on our server