我正在嘗試使用以下命令使用pip安裝PIL：pip install PIL但我收到以下錯誤，我不知道這意味著什么。有人可以幫幫我。nishant@nishant-Inspiron-1545:~$ pip install PILRequirement already satisfied (use --upgrade to upgrade): PIL in /usr/lib/python2.7/dist-packages/PILCleaning up...Exception:Traceback (most recent call last):File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 104, in mainstatus = self.run(options, args)File "/usr/lib/python2.7/dist-packages/pip/commands/install.py", line 265, in runrequirement_set.cleanup_files(bundle=self.bundle)File "/usr/lib/python2.7/dist-packages/pip/req.py", line 1081, in cleanup_filesrmtree(dir)File "/usr/lib/python2.7/dist-packages/pip/util.py", line 29, in rmtreeonerror=rmtree_errorhandler)File "/usr/lib/python2.7/shutil.py", line 252, in rmtreeonerror(os.remove, fullname, sys.exc_info())File "/usr/lib/python2.7/dist-packages/pip/util.py", line 46, in rmtree_errorhandleros.chmod(path, stat.S_IWRITE)OSError: [Errno 1] Operation not permitted: '/home/nishant/build/pip-delete-this-directory.txt'Storing complete log in /home/nishant/.pip/pip.logTraceback (most recent call last):File "/usr/bin/pip", line 9, in <module>load_entry_point('pip==1.1', 'console_scripts', 'pip-2.7')()File "/usr/lib/python2.7/dist-packages/pip/__init__.py", line 116, in mainreturn command.main(args[1:], options)File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 141, in mainlog_fp = open_logfile(log_fn, 'w')File "/usr/lib/python2.7/dist-packages/pip/basecommand.py", line 168, in open_logfilelog_fp = open(filename, mode)IOError: [Errno 13] Permission denied: '/home/nishant/.pip/pip.log'