Object-Oriented Programming · Question 29 · Hard
What is the output of the following Python code?
class A:
def f(self):
return "A"
class B(A):
def f(self):
return "B" + super().f()
class C(A):
def f(self):
return "C" + super().f()
class D(B, C):
pass
print(D().f())- BA
- BCAA
- BCA
- B
Answer and explanation
Answer: C. BCA
Explanation: D's method resolution order is D, B, C, A. B.f calls super().f(), which goes to the next class in D's MRO, which is C, not A. C then calls A. The result is 'B' + 'C' + 'A' = BCA.
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