C++ enum instance equivalent in Python

This question already has an answer here:

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

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Here's what i found:

How can I represent an 'Enum' in Python?

tl;dr:

class Animal:
DOG = 1
CAT = 2

x = Animal.DOG

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Until Python 3.4, the Pythonic approach would be to just use integers:

MODE_UPPERCASE, MODE_LOWERCASE, MODE_PUNCTUATION = range(3)

mode = MODE_UPPERCASE

switch_mapping = {
    MODE_UPPERCASE: handle_upper,
    # etc.
}

If you are using 3.4 or newer, you can use the new enum library:

from enum import Enum

Mode = Enum('Mode', 'uppercase lowercase punctuation')
mode = Mode.uppercase

switch_mapping = {
    Mode.uppercase: handle_upper,
    # etc.
}

The enumeration values are still integers in this case (as the functional API I used here auto-assigns integers from 1).

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In python 3 you juste have to do this:

from enum import Enum

class modeType(Enum):
    UPPERCASE       =1
    LOWERCASE       =2
    PUNCTUATION =3

See the official : https://docs.python.org/3/library/enum.html

链接地址: http://www.djcxy.com/p/91744.html

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