python 包安装bug集

Exception:Traceback (most recent call last): File "/usr/local/lib/python2.7/dist-packages/pip/basecommand.py", line 215, in main status = self.run(options, args) File "/usr/local/lib/python2.7/dist-packages/pip/commands/install.py", line 342, in run prefix=options.prefix_path, File "/usr/local/lib/python2.7/dist-packages/pip/req/req_set.py", line 784, in install **kwargs File "/usr/local/lib/python2.7/dist-packages/pip/req/req_install.py", line 851, in install self.move_wheel_files(self.source_dir, root=root, prefix=prefix) File "/usr/local/lib/python2.7/dist-packages/pip/req/req_install.py", line 1064, in move_wheel_files isolated=self.isolated, File "/usr/local/lib/python2.7/dist-packages/pip/wheel.py", line 345, in move_wheel_files clobber(source, lib_dir, True) File "/usr/local/lib/python2.7/dist-packages/pip/wheel.py", line 316, in clobber ensure_dir(destdir) File "/usr/local/lib/python2.7/dist-packages/pip/utils/init.py", line 83, in ensure_dir os.makedirs(path) File "/usr/lib/python2.7/os.py", line 157, in makedirs mkdir(name, mode)OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/selenium-3.3.1.dist-info'I tried to install python package.Then some error is showing like “exeption…” why?----