1class Currency:
 2    def __init__(self, name, exchange_rate):
 3        self.name = name
 4        self.exchange_rate = exchange_rate
 5
 6    def __eq__(self, other):
 7        return self.name == other.name and self.exchange_rate == other.exchange_rate
 8
 9
10class PoliticalParty:
11    def __init__(self, name, motto, members=None, preferred_currency=None):
12        self.name = name
13        self.__motto = motto
14        self.members = [] if members is None else members
15        self.preferred_currency = preferred_currency
16
17    def __str__(self):
18        return self.name
19
20    def __add__(self, other):
21        if isinstance(self, PoliticalParty) and isinstance(other, PoliticalParty):
22            return Coalition(self, other)
23        else:
24            return NotImplemented
25
26    @property
27    def motto(self):
28        return self.__motto
29
30    def convert_currency_to_voters(self, given_amount_currency, currency):
31        if self.preferred_currency is not None and self.preferred_currency == currency:
32            return int((given_amount_currency / currency.exchange_rate) * 2)
33        else:
34            return int(given_amount_currency / currency.exchange_rate)
35
36
37class Coalition:
38    def __init__(self, *parties):
39        self._parties = parties
40
41    def __str__(self):
42        return "-".join(self.members.keys())
43
44    def __add__(self, other):
45        if isinstance(self, Coalition) and isinstance(other, PoliticalParty):
46            return Coalition(*(self._parties + (other,)))
47        elif isinstance(self, Coalition) and isinstance(other, Coalition):
48            return Coalition(*(self._parties + other._parties))
49        else:
50            return NotImplemented
51
52    @property
53    def members(self):
54        return {party.name: party.members for party in self._parties}
55
56
57class Elections:
58    _elections_held_in_given_year = {}
59
60    def __init__(self, year):
61        self._year = year
62        self._results = {}
63        Elections._elections_held_in_given_year[year] = self
64
65    def register_party_or_coalition(self, party_or_coalition):
66        self._results.setdefault(party_or_coalition, 0)
67
68    def vote(self, party_or_coalition):
69        if party_or_coalition in self._results:
70            self._results[party_or_coalition] += 1
71
72    def rig_elections(self, party_or_coalition, given_amount_currency, currency):
73        if party_or_coalition in self._results:
74            if isinstance(party_or_coalition, PoliticalParty):
75                votes = party_or_coalition.convert_currency_to_voters(given_amount_currency, currency)
76            elif isinstance(party_or_coalition, Coalition):
77                votes = max(party.convert_currency_to_voters(given_amount_currency, currency) for party in
78                            party_or_coalition._parties)
79            else:
80                return
81            self._results[party_or_coalition] += votes
82
83    def get_results(self):
84        return {str(party_or_coalition): votes for party_or_coalition, votes in self._results.items()}
85
86    @classmethod
87    def get_results_by_year(cls, year):
88        if year in cls._elections_held_in_given_year:
89            return {year: cls._elections_held_in_given_year[year].get_results()}
90        else:
91            return {}