我无法安装 PIL。终端显示拒绝访问目录。如何获得对目录的访问权限

I'm not able to install PIL. Terminal says access denied to directory. How to gain access to the directory

我在终端中输入了这个命令

easy_install PIL

终端是这样说的:

    *error: can't create or remove files in install directory
The following error occurred while trying to add or remove files in the
installation directory:
    [Errno 13] Permission denied: '/Library/Python/2.7/site-packages/test-easy-install-639.pth'
The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:
    /Library/Python/2.7/site-packages/
Perhaps your account does not have write access to this directory?  If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account.  If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.
For information on other options, you may wish to consult the
documentation at:
  https://pythonhosted.org/setuptools/easy_install.html
Please make the appropriate changes for your system and try again.*

我该如何继续?

尝试在 easy_install

之前添加 sudo
sudo easy_install Pillow

您说过,您正在尝试安装 PIL,但 easy_install PI 命令不会安装它,您输入错误。 虽然在我看来你可以试试这个

pip install --user Pillow

[额外

为什么在安装 Python 库时不应该使用 sudo?

。 ]