Which of the following statements about inheritance and MRO in Python are CORRECT?
All three statements are correct. Python supports multiple inheritance, a class's MRO can be inspected with .mro() or .__mro__, and ordinary Python 3 classes ultimately inherit from object. A subclass can call overridden superclass methods using super() or explicit parent-class calls.
What is the value printed?
class Base:
def msg(self):
return 5
class Derived(Base):
def msg(self):
return super().msg() * 3$d = Derived()
print(d.msg())$
d.msg() calls super().msg() (which returns 5) and multiplies by 3 -> 15.
In Python, if class Child(Parent1, Parent2) is defined, which parent class's attribute is searched first?
Left-to-right ordering in base class list determines precedence. Parent1 is searched before Parent2.
Evaluate:
class A:
st = 100
class B(A):
pass
class C(B):
passC.st = 200
print(A.st)
Setting C.st = 200 assigns an attribute specifically to class C. Class A's st attribute remains 100.
What is the result of calling isinstance(True, int)?
Since bool inherits from int, True is an instance of int.