直接用 pip install python-nmap 报错如下：
Command "/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python -u -c "
import setuptools, tokenize;__file__='/private/var/folders/ts/p7qtmdfj4glcvyx_nwvw2c9w0000gn/T/pip-build-MaNV8S/python-nmap/setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record /var/folders/ts/p7qtmdfj4glcvyx_nwvw2c9w0000gn/T/pip-RwNT5o-record/install-record.txt --single-version-externally-managed --compile --prefix=/usr/local" failed with error code 1 in /private/var/folders/ts/p7qtmdfj4glcvyx_nwvw2c9w0000gn/T/pip-build-MaNV8S/python-nmap/
初步判断是没有权限在private文件夹下写文件，接下来用：
sudo pip install python-nmap
输入管理员密码后
安装成功