The getpass module provides two functions:
'Password: '. Availability: Macintosh, Unix, Windows.
This function checks the environment variables $LOGNAME, $USER, $LNAME and $USERNAME, in order, and returns the value of the first one which is set to a non-empty string. If none are set, the login name from the password database is returned on systems which support the pwd module, otherwise, an exception is raised.