using function attributes as return values

This question already has an answer here:

How can I represent an 'Enum' in Python? 43 answers

---

While you can, I wouldn't, especially now that Python has an Enum type in 3.4 which has been backported.

Your example above might look like this as an Enum :

class Size(Enum):

    small = 1
    medium = 2
    large = 3

    @classmethod
    def classify(cls, number):
        if number < 10:
            return cls.small
        elif number < 20:
            return cls.medium
        else:
            return cls.large

In use:

--> Size.classify(15)
<Size.medium: 2>

---

namedtuple ，也许？

>>> from collections import namedtuple
>>> 
>>> SizeSpec = namedtuple('SizeSpec', ['small', 'medium', 'large'])
>>> 
>>> size = SizeSpec(small=1, medium=2, large=3)
>>> 
>>> size.small
1
>>> size.medium
2
>>> size.large
3

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