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'