Python使用另一个dict扩展__dict__对象

class MyClass:
    def __init__(self):
        self.__dict__ = {'key1': 'value1', 'key2': 'value2'}

obj = MyClass()
print(obj.__dict__)  # 输出: {'key1': 'value1', 'key2': 'value2'}

# 使用另一个字典扩展__dict__对象
extension = {'key3': 'value3', 'key4': 'value4'}
obj.__dict__.update(extension)
print(obj.__dict__)  # 输出: {'key1': 'value1', 'key2': 'value2', 'key3': 'value3', 'key4': 'value4'}

class MyClass:
    def __init__(self):
        self.__dict__ = {'key1': 'value1', 'key2': 'value2'}

obj = MyClass()
print(obj.__dict__)  # 输出: {'key1': 'value1', 'key2': 'value2'}

# 直接赋值扩展__dict__对象
obj.__dict__['key3'] = 'value3'
obj.__dict__['key4'] = 'value4'
print(obj.__dict__)  # 输出: {'key1': 'value1', 'key2': 'value2', 'key3': 'value3', 'key4': 'value4'}