# Chinese = Mymeta(class_name,class_bases,class_dic)
# 创建元类如下：
class Mymeta(type):
def __init__(self, class_name, class_bases, class_dic):
# print(class_name)
# print(class_bases)
# print(class_dic)
# 打印结果如下：
'''
Chinese
(<class 'object'>,)
{'__module__': '__main__', '__qualname__': 'Chinese',
'country': 'china', '__init__': <function Chinese.__init__ at 0x0000019CC0750AE8>,
'talk': <function Chinese.talk at 0x0000019CC0750B70>}
'''
super(Mymeta, self).__init__(class_name, class_bases, class_dic)
class Chinese(object, metaclass=Mymeta): # metaclass 元类
country = 'china'
def __init__(self, name, age):
self.name = name
self.age = age
def talk(self):
print('%s is talking' % self.name)
# ------------例子控制类----------------------------------------
class Mymeta(type):
def __init__(self, class_name, class_bases, class_dic):
if not class_name.istitle(): # class_name 首字母不是大写就报类型错误
raise TypeError('类型错误')
if '__doc__' not in class_dic or not class_dic['__doc__'].strip():
raise TypeError('必需要有注释且不能为空')
super(Mymeta, self).__init__(class_name, class_bases, class_dic)
class Chinese(object, metaclass=Mymeta): # metaclass 元类
"""
这是中国人的类
"""
country = 'china'
def __init__(self, name, age):
self.name = name
self.age = age
def talk(self):
print('%s is talking' % self.name)
