无法从继承中获取字符串值

class ParentClass:
    def __init__(self, string_value):
        self.string_value = string_value
    
    def get_string_value(self):
        return self.string_value

class ChildClass(ParentClass):
    def __init__(self, string_value, other_value):
        super().__init__(string_value)
        self.other_value = other_value
    
    def get_other_value(self):
        return self.other_value

parent = ParentClass("Hello")
child = ChildClass("World", 42)

print(parent.get_string_value())  # Output: Hello
print(child.get_string_value())   # Output: World
print(child.get_other_value())    # Output: 42