如何在Python中列出对象的所有属性？

class MyClass:
    def __init__(self):
        self.name = "John"
        self.age = 30

    def say_hello(self):
        print("Hello!")

my_obj = MyClass()

# 列出对象的所有属性
attributes = dir(my_obj)

# 打印属性列表
for attr in attributes:
    print(attr)

__class__
__delattr__
__dict__
__dir__
__doc__
__eq__
__format__
__ge__
__getattribute__
__gt__
__hash__
__init__
__init_subclass__
__le__
__lt__
__module__
__ne__
__new__
__reduce__
__reduce_ex__
__repr__
__setattr__
__sizeof__
__str__
__subclasshook__
__weakref__
age
name
say_hello