尝试使用Sudo和sudo -I提示终端输入密码，即使输入密码后，密码也不会运行。
Last login: Fri Jan 4 08:48:43 on ttys000
Kumars-MacBook-Air:~ getyoteam$ pip install BeautifulSoup4
-bash: pip: command not found.
Kumars-MacBook-Air:~ getyoteam$ easy_install pip
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-906.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.
Kumars-MacBook-Air:~ getyoteam$
要添加beautifulsoup4库需要做什么？