caifrjlt@md-hk-8 [~/pip-9.0.1]# python setup.py install
/usr/lib64/python2.6/distutils/dist.py:266: UserWarning: Unknown distribution option: 'python_requires'
warnings.warn(msg)
running install
error: can't create or remove files in install directory

The following error occurred while trying to add or remove files in the
installation directory:

[Errno 30] Read-only file system: '/usr/lib/python2.6/site-packages/test-easy-install-278570.write-test'

The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

/usr/lib/python2.6/site-packages/

Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.

For information on other options, you may wish to consult the
documentation at:

http://peak.telecommunity.com/EasyInstall.html

Please make the appropriate changes for your system and try again.