MAC 下用 pip 安装时出现 OSError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/

在MAC上用pip安装zbarlight时出现如下错误

➜  zbarlight git:(zxdev) ✗ pip install zbarlightCollecting zbarlightRequirement already satisfied: Pillow in /Users/zhangxin/Library/Python/2.7/lib/python/site-packages (from zbarlight)Requirement already satisfied: olefile in /Users/zhangxin/Library/Python/2.7/lib/python/site-packages (from Pillow->zbarlight)Installing collected packages: zbarlightException:Traceback (most recent call last):  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/basecommand.py", line 215, in main    status = self.run(options, args)  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/commands/install.py", line 342, in run    prefix=options.prefix_path,  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_set.py", line 784, in install    **kwargs  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 851, in install    self.move_wheel_files(self.source_dir, root=root, prefix=prefix)  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/req/req_install.py", line 1064, in move_wheel_files    isolated=self.isolated,  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/wheel.py", line 345, in move_wheel_files    clobber(source, lib_dir, True)  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/wheel.py", line 316, in clobber    ensure_dir(destdir)  File "/Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/utils/__init__.py", line 83, in ensure_dir    os.makedirs(path)  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/os.py", line 157, in makedirs    mkdir(name, mode)OSError: [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/zbarlight'

解决方法：

sudo chown -R $USER /Library/Python/2.7/site-packages/