exercise_fluent_builder.py

class Pizza: 
    def __init__(self, builder): 
        self.garlic = builder.garlic 
        self.extra_cheese  = builder.extra_cheese 
 
    def __str__(self): 
        garlic = 'yes' if self.garlic else 'no' 
        cheese = 'yes' if self.extra_cheese else 'no' 
        info = (f'Garlic: {garlic}', f'Extra cheese: {cheese}') 
        return '\n'.join(info) 
 
    class PizzaBuilder: 
        def __init__(self): 
            self.extra_cheese = False 
            self.garlic = False 
 
        def add_garlic(self): 
            self.garlic = True 
            return self 
 
        def add_extra_cheese(self): 
            self.extra_cheese = True 
            return self 
 
        def build(self): 
            return Pizza(self) 
 
if __name__ == '__main__': 
    pizza = Pizza.PizzaBuilder().add_garlic().add_extra_cheese().build() 
    print(pizza)