When I call two methods, one from the parent class and one from the child class, only the first call-CodePudding

class Smarthphone():
    def __init__(self, tamanho, interface):
        self.tamanho = tamanho
        self.interface = interface
        
    def print_test(self):
        return "testing parent class"

class MP3Player(Smarthphone):
    def __init__(self, tamanho, interface, capacidade):
        super().__init__(tamanho, interface)
        self.capacidade = capacidade
        
    def print_MP3Player(self):
        return f"tamanho:{self.tamanho} interface:{self.interface} capacidade:{self.capacidade}"
        
        

ob1 = MP3Player(5, 'led', '240GB')

ob1.print_test()
ob1.print_MP3Player()

output:

'tamanho:5 interface:led capacidade:240GB'

If I swap the calls order the output would be 'testing parent class'.

Why does this happen?

CodePudding user response：

You aren't printing anything. Whatever UI you are using is just showing you the last value the script produced. Do it the right way:

print(ob1.print_test())
print(ob1.print_MP3Player())