python
class ClassA:
def __init__(self, numA=0, numB=0):
self.numA = numA
self.numB = numB
class ClassB(ClassA):
def set_num(self, numA, numB):
self.numA = numA
self.numB = numB
def show(self):
print(f'numA: {self.numA}, numB: {self.numB}')
# 測試
b = ClassB()
b.set_num(5, 10)
b.show()