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# definice tridy - popis entity class Complex: # kontruktor def __init__ (self, r, i): self.re = r self.im = i self.print_format = "slozky" def print (self): print("{} {}".format(self.re, self.im)) def __str__ (self): if self.print_format == "slozky": return "{0}{1:+}i".format(round(self.re,2), round(self.im, 2)) else: return "A*e^i(modul)" def add (self, other): self.re = self.re + other.re self.im = self.im + other.im def __add__ (self, other): return Complex(self.re + other.re, self.im + other.im) def modul (self): """ vypocet modulu """ def angle (self): """ vypocet uhlu """ # instance a = Complex(2.2, 3.3) b = Complex(-4.1, 0.2) # a.add(b) c = a + b print(id(a)) print(type(a)) print("a = {}".format(a)) print("b = {}".format(b)) print("c = {}".format(c))
class Book: def __init__ (self, title, author, year): self.title = title self.author = author self.year = year self.sorting_order = 0 # 0 - title, 1 - surname, 2 - year def __str__ (self): return "title: {}\nauthor: {}\nyear: {}".format(self.title, self.author, self.year) def __lt__ (self, other): if self.sorting_order == 0: return self.title < other.title elif self.sorting_order == 1: a = self.author.split() b = other.author.split() return a[1] < b[1] elif self.sorting_order == 2: return self.year < other.year knihovna = [] kniha_a = Book ("Honzikova cesta", "Bohumil Riha", 1954) kniha_b = Book ("Cuk a Gek", "Arkadij Gajdar", 1935); knihovna.append (kniha_a) knihovna.append (kniha_b) knihovna.append (Book("Robinson Crusoe", "Daniel Defoe", 1800)) knihovna = sorted(knihovna) for i in range(len(knihovna)): print(knihovna[i]) print("------------")