win32security.LookupAccountName
PySID, string, int = LookupAccountName(systemName, accountName )
Accepts the name of a system and an account as input. It retrieves a security identifier (SID) for the account and the name of the domain on which the account was found.
Parameters
Return Value
The result is a tuple of new SID object, the domain name where the account was found, and the type of account the SID is for.