Python（Django）类，将列表索引行为别名/重载到属性

Question

我有一个课程，存储一周的信息：

from django.db import models

#A django model, so can't subclass list (at least not easily)
class MyWeek(models.Model):
    sunday    = "foo"
    monday    = "foo"
    tuesday   = "foo"
    wednesday = "foo"
    thursday  = "foo"
    friday    = "foo"
    saturday  = "foo"

我希望能够像访问列表一样访问这些属性：

aweek = Myweek()

#I want this
aweek[0] = "bar"
myvar = aweek[1]

#To be shorthand for this
aweek.monday = "bar"
myvar = aweek.tuesday

#and of course
aweek[7]
ValueError/IndexError: Week indexes monday to 0 and sunday to 6, there is no 7

关于python的每一件事都让我觉得这是可能和容易的，只要我知道要重载的一组正确的东西。你知道吗

我考虑过@property，但这没有多大帮助，因为我希望能够使用一个变量来访问它：

#I want to be able to do this
aweek[somevar] = "bar"

#and via property, i'd have to use exec
#and this is just ugly and scary from an "oh god, what could somevar be" perspective
exec("aweek.%s = 'bar'" % somevar)

#Or, as kojiro pointed out below, it could be done like this:
setattr(aweek, "somevar", "bar")

谢谢。你知道吗

编辑：工作代码，hattip to kojiro for help with the right methods to overload:

# overload []
def __getitem__(self, index):       
    index = int(index) #will raise value error if uncoercable, this is desired behavior
    if index < 0 or index > 6:
        raise ValueError("Requires an integer index between 0 and 6, monday is 0 sunday is 6")
    if index == 0:
        return self.monday
    elif index == 1:
        return self.tuesday
    elif index == 2:
        return self.wednesday
    elif index == 3:
        return self.thursday
    elif index == 4:
        return self.friday
    elif index == 5:
        return self.saturday
    elif index == 6:
        return self.sunday   

# overload set []
def __setitem__(self, index, item):
    index = int(index) #will raise value error if uncoercable, this is desired behavior
    if index < 0 or index > 6:
        raise ValueError("Requires an integer index between 0 and 6, monday is 0 sunday is 6")
    if index == 0:
        self.monday = item
        return
    elif index == 1:
        self.tuesday = item
        return
    elif index == 2:
        self.wednesday = item
        return
    elif index == 3:
        self.thursday = item
        return
    elif index == 4:
        self.friday = item
        return
    elif index == 5:
        self.saturday = item
        return
    elif index == 6:
        self.sunday = item
        return

Answer 1

要在python中创建类似列表的对象，需要创建以下方法：

__len__、__getitem__、__setitem__、__delitem__、__iter__和__contains__

Link to explanatory example.