Object Oriented Programming - General Questions

What is the output of the following code?

class Acc:
    def __init__(self):
        self.__bal = 100
a = Acc()
print(hasattr(a, '__bal'), a._Acc__bal)

What is the output of the following code?

class A: pass
class B(A): pass
print(isinstance(B(), A), issubclass(A, B))

What is the output of the following code?

class P:
    def __init__(self, x):
        self.x = x
    def __str__(self):
        return f'P({self.x})'
print(P(3))

What is the output of the following code?

class Bag:
    def __init__(self):
        self.items = [1, 2, 3]
    def __len__(self):
        return len(self.items)
print(len(Bag()))

What is the output of the following code?

class A:
    count = 0
    def __init__(self):
        A.count += 1
A(); A()
print(A.count)