1class Currency:
 2    def __init__(self, name, required_for_one_vote):
 3        self.name = name
 4        self.required_for_one_vote = required_for_one_vote
 5
 6    def __eq__(self, other):
 7        return (
 8            False
 9            if other is None
10            else (self.name == other.name and self.required_for_one_vote == other.required_for_one_vote)
11        )
12
13    def __hash__(self):
14        return hash(self.name)
15
16    def convert_to_voters(self, amount):
17        return int(amount / self.required_for_one_vote)
18
19
20class PoliticalParty:
21    def __init__(self, name, motto, members=None, preferred_currency=None):
22        self.name = name
23        self._motto = motto
24        self.members = members[:] if members else []  # Check for mutating in tests
25        self.preferred_currency = preferred_currency
26
27    def __str__(self):
28        return self.name
29
30    @property
31    def motto(self):
32        return self._motto
33
34    def convert_currency_to_voters(self, amount, currency):
35        multiplier = 2 if currency == self.preferred_currency else 1
36        return currency.convert_to_voters(amount) * multiplier
37
38    def __add__(self, other_party):
39        return Coalition(self, other_party)
40
41
42class Coalition:
43    def __init__(self, *parties):
44        self.parties = list(parties)
45
46    def __str__(self):
47        return "-".join(str(party) for party in self.parties)
48
49    @property
50    def members(self):
51        return {str(party): party.members for party in self.parties}
52
53    def __add__(self, coalition_or_party):
54        parties_to_append = (
55            [coalition_or_party] if isinstance(coalition_or_party, PoliticalParty) else coalition_or_party.parties
56        )
57        return self.__class__(*self.parties, *parties_to_append)
58
59    def convert_currency_to_voters(self, amount, currency):
60        preferred_currencies = {party.preferred_currency: party for party in self.parties}
61        return preferred_currencies.get(currency, self.parties[0]).convert_currency_to_voters(amount, currency)
62
63
64class Elections:
65    ELECTIONS_HISTORY = {}
66
67    def __init__(self, year):
68        self.year = year
69        self.__votes = {}
70        self.ELECTIONS_HISTORY[year] = self
71
72    @classmethod
73    def get_results_by_year(cls, year):
74        return cls.ELECTIONS_HISTORY[year].get_results()
75
76    def register_party_or_coalition(self, *parties_or_coalitions):
77        self.__votes |= {str(party_or_coallition): 0 for party_or_coallition in parties_or_coalitions}
78
79    def rig_elections(self, party_or_coalition, amount, currency):
80        self.__votes[str(party_or_coalition)] += party_or_coalition.convert_currency_to_voters(amount, currency)
81
82    def get_results(self):
83        return self.__votes
84
85    def vote(self, party_or_coalition):
86        self.__votes[str(party_or_coalition)] += 1