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[英]How do I define a Python method that I only want to use in the __init__ method, i.e., that is not accessible from outside the class definition?
[英]How do I define a Python property *outside* of a class definition?
我想在类定义之外定义一个 Python 属性:
c = C()
c.user = property(lambda self: User.objects.get(self.user_id))
print c.user.email
但我收到以下错误:
AttributeError: 'property' object has no attribute 'email'
在类定义之外定义属性的正确语法是什么?
顺便说一句:我在用生菜
from lettuce import *
from django.test.client import Client
Client.user_id = property(lambda self: self.browser.session.get('_auth_user_id'))
Client.user = property(lambda self: User.objects.get(self.user_id))
@before.each_scenario
def set_browser(scenario):
world.browser = Client()
像c
这样的对象实例不能有属性; 只有像C
这样的类才能拥有属性。 所以你需要在类上设置属性,而不是实例,因为 Python 只在类上查找它:
C.user = property(lambda self: User.objects.get(self.user_id))
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