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>}