通过存储在字符串中的名称创建类的对象？

class Person:
    def __init__(self, name):
        self.name = name

    def say_hello(self):
        print(f"Hello, my name is {self.name}.")

class_name = "Person"
obj = eval(class_name)(name="John")
obj.say_hello()  # 输出：Hello, my name is John.

class_name = "Person"
obj = globals()[class_name](name="John")
obj.say_hello()  # 输出：Hello, my name is John.