How to know if a script is running as administrator?

Question

Python

You need to find out that the script is running on behalf of the administrator. And if not, then close the program and politely ask to run it from the admin

Answer 1

import ctypes, os
try:
 is_admin = os.getuid() == 0
except AttributeError:
 is_admin = ctypes.windll.shell32.IsUserAnAdmin() != 0

print is_admin

Answer 2

whoami
There is os.getuid() which "Returns the current process's user id.". But how do I find out any given user's id?
The root user has id 0