安装「splinter」提示「Operation not permitted」

我安装 splinter 提示

Exception:
Traceback (most recent call last):
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/commands/install.py", line 299, in run
    root=options.root_path,
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/req/req_set.py", line 646, in install
    **kwargs
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/req/req_install.py", line 813, in install
    self.move_wheel_files(self.source_dir, root=root)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/req/req_install.py", line 1008, in move_wheel_files
    isolated=self.isolated,
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/wheel.py", line 371, in move_wheel_files
    clobber(source, dest, False, fixer=fixer, filter=filter)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/wheel.py", line 310, in clobber
    ensure_dir(destdir)
  File "/Library/Python/2.7/site-packages/pip-7.1.0-py2.7.egg/pip/utils/__init__.py", line 70, in ensure_dir
    os.makedirs(path)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 150, in makedirs
    makedirs(head, mode)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 150, in makedirs
    makedirs(head, mode)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 150, in makedirs
    makedirs(head, mode)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 1] Operation not permitted: '/System/Library/Frameworks/Python.framework/Versions/2.7/selenium'