Mac sudo pip install scikit-image error with sudo pip install scikit-image--user-u

Exception:

Traceback (most recent):

File "/library/python/2.7/site-packages/pip/basecommand.py", line 215, in main

Status = Self.run (options, args)

File "/library/python/2.7/site-packages/pip/commands/install.py", line 342, in run

Prefix=options.prefix_path,

File "/library/python/2.7/site-packages/pip/req/req_set.py", line 778, in install

Requirement.uninstall (Auto_confirm=true)

File "/library/python/2.7/site-packages/pip/req/req_install.py", line 754, in Uninstall

Paths_to_remove.remove (auto_confirm)

File "/library/python/2.7/site-packages/pip/req/req_uninstall.py", line +, in remove

Renames (path, New_path)

File "/library/python/2.7/site-packages/pip/utils/__init__.py", line 267, in renames

Shutil.move (old, new)

File "/system/library/frameworks/python.framework/versions/2.7/lib/python2.7/shutil.py", line 302, in move

Copy2 (SRC, REAL_DST)

File "/system/library/frameworks/python.framework/versions/2.7/lib/python2.7/shutil.py", line 131, in Copy2

Copystat (SRC, DST)

File "/system/library/frameworks/python.framework/versions/2.7/lib/python2.7/shutil.py", line 103, in Copystat

Os.chflags (DST, St.st_flags)

OSError: [Errno 1] Operation not permitted: '/tmp/pip-aejf6u-uninstall/system/library/frameworks/python.framework/ Versions/2.7/extras/lib/python/six-1.4.1-py2.7.egg-info '

Mac sudo pip install scikit-image error with sudo pip install scikit-image--user-u