测试代码如下:
复制代码 代码如下:
class ModelMetaClass(type):
def __new__(cls,name,base,attrs):
logging.info(\”cls is:\”+str(cls))
logging.info(\”name is:\”+str(name))
logging.info(\”base is:\”+str(base))
logging.info(\”attrs is:\”+str(attrs))
return type.__new__(cls,name,base,attrs)
pass
pass
class Model(dict):
__metaclass__ = ModelMetaClass
def __init__(self):
pass
pass
def main():
m=Model()
if __name__ == \’__main__\’:
main()
测试结果:
复制代码 代码如下:
INFO:root:cls is:
INFO:root:name is:Model
INFO:root:base is:(
INFO:root:attrs is:{\’__module__\’: \’__main__\’, \’__metaclass__\’:
结论就显而易见了。cls是当前类的名字,即类本身。name是通过__metaclass__属性指向ModelMetaClass的类,即要实例化的类,ModelMetaClass拦截了该类的实例化。base是要实例化的类的基类。attrs是要实例化的类的属性集合。