hashables.py

# -*- coding: utf-8 -*-

from __future__ import print_function
import hashlib

class City(object):
    """ This is the Foo object
    """
    def __init__(self, name, population):
        self._name = name
        self._population = population

    @property
    def name(self):
        return self._name

    @property
    def population(self):
        return self._population

    def __repr__(self):
        """ representation of foo.
        """
        return '<Foo: %s|%s>' % (self.name, self.population)

    def __hash__(self):
        hashstring = '%s%s' % (self.name, self.population)
        hd = hashlib.md5(hashstring.encode('utf-8')).hexdigest()
        return int(hd, 16)

    def __eq__(self, other):
        nam = (other.name == self.name)
        pop = (other.population == self.population)
        return True if nam and pop else False


if __name__ == '__main__':
    s = City('Stuttgart', 75000)
    r = City('Ravensburg', 40000)
    t = City('Ravensburg', 40000)
    bar = set()
    bar.add(s)
    bar.add(r)
    bar.add(t)
    from IPython import embed; embed()
# vim: set ft=python ts=4 sw=4 expandtab :