1class Currency:
  2    def __init__(self, currency_name, ammount):
  3        self.currency = currency_name
  4        self.ammount = ammount
  5
  6    def __eq__(self, other):
  7        if not isinstance(other, Currency): #прочетох, че е добра практика да се проверява
  8            return False
  9
 10        return self.currency == other.currency and self.ammount == other.ammount
 11
 12
 13class PoliticalParty:
 14    def __init__(self, name, motto, members = None, preferred_currency = None):
 15        self.party_name = name
 16        self._motto = motto
 17        self.members = members if members is not None else []
 18        self.preferred_currency = preferred_currency
 19
 20    @property
 21    def motto(self):
 22        return self._motto
 23
 24    def convert_currency_to_voters(self, ammount, other_currency):
 25        if not isinstance(other_currency, Currency):
 26            return 0
 27        
 28        voters_count = int(round(ammount / other_currency.ammount, 10))
 29
 30        if self.preferred_currency == other_currency:
 31            return voters_count * 2
 32        return voters_count
 33
 34    def __str__(self):
 35        return self.party_name
 36
 37    def __add__(self, other):
 38        if isinstance(other, PoliticalParty):
 39            return Coalition(self, other)
 40        return None
 41
 42
 43class Coalition():
 44    def __init__(self, *args):
 45        self.members = {}
 46        self.parties = []
 47        #пазя отделно партиите, за да мога да проверя за по удобна валута при купени (кхъм обичайни) изборите
 48
 49        for party in args:
 50            if isinstance(party, PoliticalParty):
 51                self.members[party.party_name] = party.members
 52                self.parties.append(party)
 53
 54    def __add__(self, other):
 55        new_coalition = Coalition()
 56        new_coalition.members = self.members.copy()
 57        new_coalition.parties = self.parties.copy()
 58
 59        if isinstance(other, PoliticalParty):
 60            new_coalition.members[other.party_name] = other.members
 61            new_coalition.parties.append(other)
 62
 63        elif isinstance(other, Coalition):
 64            new_coalition.members.update(other.members)
 65            new_coalition.parties.extend(other.parties)
 66
 67        return new_coalition
 68    
 69    def __str__(self):
 70        return '-'.join(self.members.keys())
 71    
 72
 73class Elections:
 74    _elections_by_year = {}
 75
 76    def __init__(self, year):
 77        self.year = year
 78        self.candidates = {}
 79        Elections._elections_by_year[year] = self
 80
 81    def register_party_or_coalition(self, to_add):
 82        if isinstance(to_add, PoliticalParty) or isinstance(to_add, Coalition):
 83            self.candidates[to_add] = 0
 84        else:
 85            return None
 86            
 87    def vote(self, vote_for):
 88        if vote_for in self.candidates:
 89            self.candidates[vote_for] += 1
 90        else:
 91            return None
 92        #бихте ли ми казали какво да връщам в такива случаи,
 93        #или да очаквам, че ще говорим за exceptions в някакъв момента
 94
 95    def rig_elections(self, candidate, ammount, currency):
 96        if not isinstance(currency, Currency):
 97            return None
 98        
 99        if candidate not in self.candidates:
100            return None
101        
102        #тук добре ли е да има празен ред между if-а И elif-а с цел четимост
103        if isinstance(candidate, PoliticalParty):
104            self.candidates[candidate] += candidate.convert_currency_to_voters(ammount, currency)
105        elif isinstance(candidate, Coalition):
106            best_party = candidate.parties[0]
107            for party in candidate.parties:
108                if party.preferred_currency == currency:
109                    best_party = party
110                    break
111                        
112            self.candidates[candidate] += best_party.convert_currency_to_voters(ammount, currency)
113
114    def get_results(self):
115        #знам, че може и с dict comprehension, но смятам, че ще стане твърде сложно
116        res = {}
117
118        for candidate in self.candidates:
119            res[str(candidate)] = self.candidates[candidate]
120        return res
121    
122    @classmethod
123    def get_results_by_year(cls, year):
124        election = cls._elections_by_year.get(year)
125        if election:
126            return election.get_results()
127        return f"Няма избори за година {year}."