看到几个字典生成式,记录下来吧!
callmap = {'GET': 'read', 'POST': 'create', 'PUT': 'update', 'DELETE': 'delete'} # def __new__(metaclass, name, bases, namespace): class Test(object): def read(self): print('get') return 'get' def create(self): print('post') return 'post' def update(self): print('put') return 'put' cls = Test # 遍历callmap字典,寻找cls类中method方法,如果有则返回键和值;如果没有,忽略 crud = { (http_method,None): getattr(cls, method) for http_method, method in list(callmap.items()) if getattr(cls, method, None) is not None } print(crud)
结果:
{'GET': <function Test.read at 0x010C0858>, 'PUT': <function Test.update at 0x010C08E8>, 'POST': <function Test.create at 0x010C08A0>}