Why function returns None?ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ ᅠ

Why does the cat1.set_size() function return None instead of "small" and the cat2.color function returns "<__ main __. Tiger object at 0x000002711C6D4DF0>" instead of "white"?

class Cat:
    def __init__(self, color, cat_type):
        self.size = "undefined"
        self.color = color
        self.cat_type = cat_type

    def set_size(self, cat_type):
        if self.cat_type == "indoor":
            self.size = "small"
        else:
            pass


class Tiger(Cat):
    def __init__(self, color, cat_type):
        super().__init__(color, cat_type)

    def set_size(self, cat_type):
        super().__init__(self, cat_type)
        if self.cat_type == "wild":
            self.size = "big"
        else:
            self.size = "undefined"


cat1 = Cat(color="black", cat_type="indoor")
cat1_size = cat1.set_size("indoor")
print(cat1.color, cat1.cat_type, cat1_size)

cat2 = Tiger(color="white", cat_type="wild")
cat2.set_size("wild")
print(cat2.color, cat2.cat_type, cat2.size)

Conclusion:

black indoor None
<__main__.Tiger object at 0x000002711C6D4DF0> wild big

>Solution :

Here’s a better organization.

class Cat:
    def __init__(self, color, cat_type):
        self.size = "undefined"
        self.color = color
        self.cat_type = cat_type

    def set_size(self):
        if self.cat_type == "indoor":
            self.size = "small"

class Tiger(Cat):
    def set_size(self):
        if self.cat_type == "wild":
            self.size = "big"

cat1 = Cat(color="black", cat_type="indoor")
cat1.set_size()
print(cat1.color, cat1.cat_type, cat1.size)

cat2 = Tiger(color="white", cat_type="wild")
cat2.set_size()
print(cat2.color, cat2.cat_type, cat2.size)

This still has problems, though. The size of the cat should not be determined by "wild" or "indoor". A Tiger, as a specific kind of Cat, should always have its size set to "big". You might have another subclass called Domestic that has its size set to "small".