config.py

import ConfigParser


class BasicUser:
    def __init__(self, username, password):
        self.username = username
        self.password = password

    def __str__(self):
        return "(username={:s}, password={:s})".format(self.username, self.password)

    def __eq__(self, other):
        if isinstance(other, self.__class__):
            return self.username == other.username and self.password == other.password
        return NotImplemented

    def __ne__(self, other):
        if isinstance(other, self.__class__):
            return not self.__eq__(other)
        return NotImplemented

    def __hash__(self):
        return hash(self.username) + hash(self.password)


def parse_users(config):
    users = set()
    sections = config.sections()
    for section in sections:
        user = BasicUser(
                config.get(section, "username"),
                config.get(section, "password")
        )
        users.add(user)
    return users

config = ConfigParser.ConfigParser()
config.read("ig.ini")
print parse_users(config)