Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 308, in run
    strip_file_prefix=options.strip_file_prefix,
  File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 646, in install
    **kwargs
  File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 816, in install
    strip_file_prefix=strip_file_prefix
  File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 1013, in move_wheel_files
    strip_file_prefix=strip_file_prefix,
  File "/usr/lib/python2.7/site-packages/pip/wheel.py", line 339, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/usr/lib/python2.7/site-packages/pip/wheel.py", line 317, in clobber
    shutil.copyfile(srcfile, destfile)
  File "/usr/lib64/python2.7/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 13] Permission denied: '/usr/lib/python2.7/site-packages/six.pyc'