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    <p>Before PEP 435, Python didn't have an equivalent but you could implement your own.</p> <p>Myself, I like keeping it simple (I've seen some horribly complex examples on the net), something like this ...</p> <pre><code>class Animal: DOG = 1 CAT = 2 x = Animal.DOG </code></pre> <hr> <p>In Python 3.4 (<a href="http://www.python.org/dev/peps/pep-0435/" rel="noreferrer">PEP 435</a>), you can make <a href="https://docs.python.org/3/library/enum.html" rel="noreferrer">Enum</a> the base class. This gets you a little bit of extra functionality, described in the PEP. For example, enum members are distinct from integers, and they are composed of a <code>name</code> and a <code>value</code>. </p> <pre><code>class Animal(Enum): DOG = 1 CAT = 2 print(Animal.DOG) # &lt;Animal.DOG: 1&gt; print(Animal.DOG.value) # 1 print(Animal.DOG.name) # "DOG" </code></pre> <hr> <p>If you don't want to type the values, use the following shortcut:</p> <pre><code>class Animal(Enum): DOG, CAT = range(2) </code></pre> <hr> <p><code>Enum</code> implementations <a href="https://docs.python.org/3/library/enum.html#how-are-enums-different" rel="noreferrer">can be converted to lists and are iterable</a>. The order of its members is the declaration order and has nothing to do with their values. For example: </p> <pre><code>class Animal(Enum): DOG = 1 CAT = 2 COW = 0 list(Animal) # [&lt;Animal.DOG: 1&gt;, &lt;Animal.CAT: 2&gt;, &lt;Animal.COW: 0&gt;] [animal.value for animal in Animal] # [1, 2, 0] Animal.CAT in Animal # True </code></pre>
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    1. POHow can I represent an 'Enum' in Python?
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    1. USAlexandru Nedelcu
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    1. COWhat's the point of defining numerical values (1 and 2)? They seem useless, and that's why I prefer zacherates' solution.
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    2. COIt is clear from the example that constants are being defined. There is an issue with type safety, however, which may cause problems.
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    3. COYou should have first created an instance of Animal class.. X = Animal() z = X.DOG
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