"""
A module with a simple Worker class.

Class demonstrates attributes and an initializer.

Author: Walker M. White (wmw2), Steve Marschner (srm2)
Date:   October 1, 2017 (Python 3 Version)
"""


class Worker(object):
    """
    A class to represent a worker in a certain organization
    
    INSTANCE ATTRIBUTES:
       lname: Last name.  [str]
       ssn:   Social security no. [int in 0..999999999]
       boss:  The worker's boss. [Worker, or None if no boss]
    """
    
    def __init__(self, lname, ssn, boss):
        """
        Initializer: Creates an instance with last name n, soc sec number s, and boss b.
        
        Parameter lname: The worker's last name
        Precondition: lname is a string
        
        Parameter ssn: The worker's social security number
        Precondition: ssn is an int in 0..999999999
        
        Parameter boss: The worker's boss
        Precondition: boss is another Worker object or None
        """
        self.lname = lname
        self.ssn   = ssn
        self.boss  = boss
    
    def __str__(self):
        """
        Returns: text representation of this Worker
        """
        return ('Worker ' + self.lname +
                '. Soc sec XXX-XX-' + str(self.ssn % 10000) +
                ('.' if self.boss is None else '. boss: ' + self.boss.lname))