Python中的C++枚举实例

Question

我在C++中有以下代码，我需要它的Python版本。没有问题的“开关”部分，我用它的字典。但我不知道如何在Python中实现“enum”部分。特别是modeType具有实例模式的部分。

enum modeType {UPPERCASE, LOWERCASE, PUNCTUATION}; 
int number; 
modeType mode = UPPERCASE; 
cout << "Enter some numbers ending with -1: "; 
do { 
    cin >> number; 
    cout << "Number read: " << number; 
    switch (mode) { 
     case UPPERCASE: 
      number = number % 27; 
      cout << ". Modulo 27: " << number << ". "; 
      if (number == 0) { 
       cout << "Switch to LOWERCASE"; 
       mode = LOWERCASE; 
      } 
      break; 
     case LOWERCASE: 
      number = number % 27; 
      cout << ". Modulo 27: " << number << ". "; 
      if (number == 0) { 
       cout << "Switch to PUNCTUATION"; 
       mode = PUNCTUATION; 
      } 
      break; 
     case PUNCTUATION: 
      number = number % 9; 
      cout << ". Modulo 9: " << number << ". "; 
      if (number == 0) { 
       cout << "Switch to UPPERCASE"; 
       mode = UPPERCASE; 
      } 
      break; 
     } 
     cout << "\n"; 
    } while (number != -1);here 

Answer 1

这里是我的发现：

How can I represent an 'Enum' in Python?

TL;博士：

class Animal: 
DOG = 1 
CAT = 2 

x = Animal.DOG 

Answer 2

直到的Python 3.4，在Python化的做法是只使用整数：

MODE_UPPERCASE, MODE_LOWERCASE, MODE_PUNCTUATION = range(3) 

mode = MODE_UPPERCASE 

switch_mapping = { 
    MODE_UPPERCASE: handle_upper, 
    # etc. 
} 

如果使用的是3.4或更新版本，您可以使用新的enum library：

from enum import Enum 

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

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

枚举值仍然在这种情况下（从1为我所用这里的functional API自动分配整数）的整数。

Answer 3

在Python 3，你探微必须这样做：

from enum import Enum 

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

看到官方：https://docs.python.org/3/library/enum.html