centos下，python安装virtualenv时报错

Question

现在发现pip安装不了东西了，错误也是下面那个
在终端输入pip install virtualenv安装virtualenv报错，错误如下

Exception:
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/pip/basecommand.py", line 223, in main
    status = self.run(options, args)
  File "/usr/lib/python2.7/site-packages/pip/commands/install.py", line 308, in run
    strip_file_prefix=options.strip_file_prefix,
  File "/usr/lib/python2.7/site-packages/pip/req/req_set.py", line 646, in install
    **kwargs
  File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 816, in install
    strip_file_prefix=strip_file_prefix
  File "/usr/lib/python2.7/site-packages/pip/req/req_install.py", line 1013, in move_wheel_files
    strip_file_prefix=strip_file_prefix,
  File "/usr/lib/python2.7/site-packages/pip/wheel.py", line 339, in move_wheel_files
    clobber(source, lib_dir, True)
  File "/usr/lib/python2.7/site-packages/pip/wheel.py", line 317, in clobber
    shutil.copyfile(srcfile, destfile)
  File "/usr/lib64/python2.7/shutil.py", line 83, in copyfile
    with open(dst, 'wb') as fdst:
IOError: [Errno 13] Permission denied: '/usr/lib/python2.7/site-packages/virtualenv.py'

Answer 1

with open(dst, 'wb') as fdst

As in the above sentence, pip在安装库时需要写入一些文件，因此需要写入权限，如果按照楼上的方法，pip命令前加上sudo依然不行，可以考虑把/usr/lib/python2.7/change the directory permissions to 666 or 777:

chmod 777 /usr/lib/python2.7

Answer 2

Permission denied

Permission issue, add sudo