pip: command not found

https://stackoverflow.com/questions/9780717/bash-pip-command-not-found suggests:
```
sudo easy_install pip
```
When I check for the **`easy_intall`** command on my mac:
```
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-51769.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.
```

So looks like **`easy_intall`** is installed on mac by default as is Python v2.7
Need to get Pip and the _latest_ python (v3)

从 issue 中的 macOS 安装问题和链接的 Stack Overflow 指南开始。查看 repository 现有的设置说明，然后记录一种受支持的安装 pip 和最新 Python 的方法，且不会出现报告的权限错误。当新的 macOS 用户能够按照说明成功完成安装时，即表示完成。

由索引模型根据 Issue 内容生成。